Polsten 20 mm AA Gun – lot 105

All our auctions are behind registration and login conditions.

Auction Expired

1944 20 mm Quadruple mounted AA Gun ‘Polsten’

Built by the John Inglis Company in Canada for the effective defend against V1 flying bombs or “Doodle Bugs ” against Southern England but also used extensively to defend Antwerp

This Quadruple Mount Polsten AA Gun
This Quadruple Mount Polsten AA Gun is still in great condition. It is a trailer version produced by the John Inglis Company from Toronto Canada. John Inglis and Company was a Canadian manufacturing firm which made weapons for the United Kingdom and British Commonwealth military forces during the World War II.

The company reincorporated in 1913 as the John Inglis Company Limited.
During World War I, the company turned out thousands of shells and shell forgings, and more than 40 steam marine engines for freighters.

In 1937, the company was purchased by Major J. E. Hahn of Toronto, owner of British Canadian Engineering Limited, who took on the name John Inglis and Company.

In March 1938, the company won a contract with the British and Canadian governments to supply 5,000 Bren machine guns to Great Britain and 7,000 to Canada. Both countries shared the capital costs of creating a factory to produce them. Inglis started production in 1940, and the contracts were extended several times.

By 1943, they were producing 60% of the Bren machine guns destined for the British Commonwealth forces, and 30% of the British Army’s own requirements. In the same period the company also produced a large proportion of the Polsten 20 mm autocannon for the British Commonwealth, as well as the Browning Hi-Power (or High Power) pistol for both the Commonwealth nations and other Canadian allies (Note: primarily the Nationalist Chinese Army). They also produced the machinery for four Tribal-class destroyers.

This unit was, after it remained in service into the 1950s, acquired by a Dutch collector in Southern part of the Netherlands in the late nighties. It was one of a lot of ONLY 3 surviving units!

He fully restored it and made it functional again in 2014. Therefore, he also acquired the 4 missing 20 AA guns from a specialized supplier in the UK to complete the set.

In 2014 and 2015 the set was often towed it in parades (70th Anniversary) and tours behind an GMC. Due to purchase of new projects the unit was sold to a Belgium collector.

 The AA Guns is still in very good condition.
Moreover, from this set are only a very few remaining examples available (as far as we know only 3 in Europe).

The AA gun will be delivered with its original canvas covers and in operational order however we mentioned that due to a non functional magnet the engine is currently not 100% running. UK and NL deactivation certificates available.

 Therefore, this unique unit will be a huge asset for a serious AA gun or vehicle related collection!

The Polsten machine gun is a 20mm weapon which has been designed primarily to fulfill an anti-aircraft role against low flying aircraft and pilotless planes.
It is similar in principle to the 20mm Oerlikon gun which was used by the Navy, and it fires the same High Explosive, Incendiary, Tracer and Armor-piercing ammunition. This makes it an extremely effective weapon when employed in the A.A. role.
In a secondary role it may be used with good effect against ground targets, e.g., soft skinned transport and lightly armored vehicles. There are several mountings on which the Polsten was used;
• No2 Universal mounting,
• Mk1 Haszaird-Baird mounting,
• 20 mm triple mounting,
• The Quadruple mounting
but it could be fitted, with slight modification to the firing gear, to other mountings on which the Oerlikon is normally carried.

Normally a spare barrel is provided with each gun. The barrel can be changed quickly and easily, and this was done frequently in order to reduce overheating and consequent barrel wear.
The Polsten magazine was normally a 30-round box type and was not really suitable for use on the quadruple mount so the 60 round Oerlikon Mk2 drum magazine was used.
This weighed 64 lb. (approx. 29 kg.) when filled with ammunition!

The Polsten machine gun had an unusual development history!
Its design originated in Poland. It was actually a Polish development of the 20 mm Oerlikon gun. The Polsten was designed to be simpler and much cheaper to build than the Oerlikon, without reducing effectiveness.

It was however transferred to the UK when the Germans invaded Poland in 1939.

The Polish team had been revising the basic Oerlikon gun with a view to simplifying the manufacture and reducing cost. The drawings were completed by a team of Polish, Czech and British designers. The design was then handed over to the British Sten Company (Pol(lish)-Sten) who produced the gun along with the John Inglis Company in Canada.

When compared to the Oerlikon cannon, which was made out of 250 parts, the Polsten was made out of 119 parts in combination with a smaller number of machining operations to turn them out without sacrificing the effectiveness or the reliability of the cannon.
Simplification of the design of the Polsten cannon made its production much cheaper.
In these days the cost of one Oerlikon cannon was about £350, while the cost of the Polsten was between £60 and £70.
The first 240 guns were produced at the end of 1943, and a further 13,548 during 1944.

In January 1944, the 21st Army Group decided that only 20 mm Polsten guns would be used as a standard light gun to simplify supply.

The Polsten was used as a substitute for the Oerlikon in the same roles, one of which was as an airborne unit anti-aircraft gun, used in Operation Market Garden. It was used on a wheeled mounting that could be towed behind a jeep.
The Quadruple Mount
Various double, triple and quadruple mounts were developed.

The design of the quadruple mounted Polsten was developed alongside the “Skink”, a modified M4A1 Grizzly medium tank which had a specially designed turret, using 4 Polsten Mk1 machine guns instead of the usual armament.

The purpose of the Skink was to provide protection for armored units and assault troops against low flying aircraft. The original program called for production of 135 complete skinks for the use of the Canadian Army and an additional 130 Skink turrets to meet British requirements.
Allied air supremacy in Northwest Europe eliminated the demand for this type of vehicle and on 23rd August 1944 the Dept of Munitions and Supply was advised by the National Defense that the program should be cancelled and only three tanks would be required. Of the three vehicles produced in Canada, one actually saw service in NWE during Feb and March 1945.
Although it wasn´t actually used in the A.A. role it was very effective in the ground role.

However, another threat loomed in 1944, that was the use of V1 flying bombs or “Doodle Bugs ” against Southern England by the Germans.

Conventional A.A. guns such as the 3.7´s and 40 mm Bofors were found to be inadequate to deal with the problem so a new A.A. gun was produced based on the Skink turret design.
The gun could be trailed into position anywhere quickly and then set up.

A team of loaders would keep the ammunition coming and the gunner would sit inside the armored turret and direct the fire using a joystick like an aircraft type control. The action was very fast, being hydraulically controlled, hydraulic power produced by a small Wisconsin single cylinder petrol engine in the rear of the turret.
The gunner had elevation control as well as traversing and could fire the guns as pairs or all at once!
A contract was placed for 1000 quad Polstens and they were all delivered.
The quadruple mount saw, next to defending the UK, service in Northwest Europe when it was used to defend Antwerp from the V1s.

By the end of 1944 / early 1945 a lorried version of the Quadruple Mount was also built using the turret and mounting from the trailer and installed it on the back of a CMP flatbed 3 tonner with a type 43 cab.

Polsten Guns, magazines and ammunition boxes were also made in Australia by General Motors Holden in South Australia’s Woodville and Beverley Plants during WW2.

They were used by the Australian Army onshore and on small boats. Several prototype gun mountings were also developed but did not see service.



Polsten 20 mm AA Gun Quadruple mounted

Existing of: Mounting Quadruple AA 20 MM C Mk1, Platform Quadruple AA 20 MM C Mk1 and Carriage Transporting Quadruple AA 20 MM C Mk1


John Inglis Company, Toronto Canada


Mounting weight:  3,910 lb. (1.777 kg)

Platform weight:    1,320 lb. (   600 kg)

Carriage weight:   1,665 lb. (   757 kg)

     Total weight:     6,895 lb. (3.134 kg)

Rate of fire:

450 rounds per min

Effective ceiling:

6,630 ft (2.221 m)

Muzzle velocity:

2,725 ft/s (830 m/s)

Magazine capacity:

60 rounds drum

4 x 20 mm Polsten Mk I AA Guns NL deactivated (with Dutch CMP certificate) :

Identification:             CW 0573

                                    CW 2204

                                    CW 2928

                                    CW 4714

Rifling:                         Concentric RH twist, 1 in 720


Overall length of gun        84″ (2,13 m.)

Length of barrel       57″ (1,45 m.)

Weight of gun          126 lb. (57kg)

Weight mag empty 31 lb. 8 oz (14,3 kg)

Weight mag. full      64 lb. (29 kg)


Wisconsin single cylinder petrol engine

Year of production:


Location: & Collection

Current location of this object is Budel, The Netherlands.
Local collection is available for this lot. Depending on the destination the Buyer shall obtain an International Import Certificate / End User Certificate. Some of the items listed in the auction may require special licenses or permits.
Please email [email protected] if you have any questions or concerns.

No item will be allowed to be collected without 100% of all legal requirements being fulfilled.


Margin / VAT

This object is offered by Tracks & Trade pursuant to consignment sale on behalf of a private individual. Therefore, the margin scheme will be applicable, so no sales tax (VAT) over the hammer price will be applicable. For more info see General Conditions of Sale Article 9. 


Inspections are open on Friday June 17th and June 24th 2022 but are conducted (if applicable) in Covid -19 safe conditions:

  • Inspections will be strictly maximum 1 hour long escorted inspections,
  • Maximum of 3 customers per escorted tour,
  • Customers must book in prior to inspection,
  • Inspection times are 9am 10am 11am 1pm 2pm 3pm 4pm,
  • Please note that these inspections might be performed at several locations,
  • Inspections for a longer period or outside these hours can be organized for a refundable fee. (Refundable off purchase price of Auction lot).


To make a booking please reply to [email protected] at least 48 hours before the inspection with the following details:

Full Name(s) and contact details and phone number of the people that are coming to inspect. The LOT number(s) and Auction Name that you wish to inspect (items are stored on several locations, and we will need to retrieve them prior to your arrival).


Parts, accessories, and militaria

The batches of spare parts and various accessories are sold as is, stored in the best conditions and without any guarantee of functioning.



Cars and motorcycles, trucks, cannons, and armored vehicles are sold in as is condition , with or without registration.



Parts, accessories, and militaria

The collection of the lots, subject to payment, starting Monday July 11th 2022 by appointment only.



Vehicles can be picked up, subject to payment, starting Monday July 11th 2022 by appointment only.
Handling costs for the removal of the vehicles will, when applicable, be applied at cost.


Arms & weapons

The Auction House will not supply ANY item unless the correct paperwork and licensing – if needed – have supplied in full.

If required and applicable (fire)arms can be made inoperable or permanently disabled by BAIV in The Netherlands as being a licensed Arms & Weapons Dealer Registration Nr. NL20191618779. In this case all relevant cost will be charged to the Buyer in addition and have to be paid in advance in full. Collection by appointment only!


Delivery and Storage

Removal of lots must be completed by Saturday August 6th 2022 after full payment and 100% coverage of all legal requirements.
No storage fees will be applicable until that date.

Lots not picked up by Buyers before Saturday August 6th 2022 will be returned to secure storage at Buyer’s expense. In this case storage fees will be applied as follows :

  • Parts & accessories: € 25,- / lot / week
  • Cars and motorcycles: € 50,- / lot / week
  • Armored vehicles, tanks, cannons etc. € 75,- / lot / week

Storage fees are excluding VAT.


General Conditions of Sale

General Conditions of Sale Version 2.0 dated 29-04-2022 are applicable 



Bids on internet

The live auction will be broadcast on: www.aution.tracksandtrade.com 

  1. Register for the auction (log in or create an account)
  2. Bid live.

Please use a computer to follow the live auction!



If any item listed causes offence, or is not correctly or incompletely described, please advise us immediately and we will address your concerns.

Please note this auction date may change due to unforeseen circumstances.


Erik van den Dungen

o.a. Director National War Museum Overloon.

This is a very rare unit for a serious collector of AA Guns and related materials or a vehicle related collection.

The history of the Polsten with its Polish, Canadian, and British roots is very interesting from an historic perspective.

Moreover, the reason that this specific AA gun was designed and built to deal and fight against the V1 flying bombs or “Doodle Bugs ” makes it highly remarkable!.


Experts estimated value:             between Euro 18.000 and 26.000,- (May 2022)