What type of gun is this

This gun was fitted on the quarterdeck of HMAS Perth in Feb 1941. There was a suggestion it is an Oerlikon but I think these were not made available to Allied ships in the Med until late 1941.

At her refit in Feb 1941 she was fitted with two captured 20mm Breda guns. The gun in the photo does not appear to be a Breda. I thought perhaps it may be a 20mm I.F Scotti AA gun.

Sorry about the quality of the photo but it’s the best I have.

Agree that the gun in the picture doesn’t appear to be a Breda, but neather a Scotti. The 20 mm Isotta Fraschini Scotti AA gun was 1,54 meters in lenght. If you compare, in your picture, the gun lenght and the man’s height, you can easily realize that the gun lenght couldn’t be one meter and a half…
For this reason i go for the 20 mm Oerlikon AA gun, that had a lenght of 2,21 meters (87 in).
The picture (below-left) was shot on the HMS Hermione and shows, exactly, an Oerlikon AA gun. The HMS Hermione was completed in 1941 and sank, in Mediterranean Sea, by the German U-Boot U-205 on June 15th, 1942.
As far as i remember the first Oerlikon built in USA was test-fired on June 8th, 1941 and 379 had been delivered by December 7th, 1941. But i am told that production and deliver, in UK, started before.
I found the second picture with the following caption This 20 mm Oerlikon anti-aircraft gun is manned by Frank Kalar, of Riverside (CA), crew member of an US destroyer escort, 1943.
I think that the gun in the picture you posted, spruso, should be an Oerlikon.

HMS Hermione Oerlikon.jpg

Oerlikon AA gun.jpg

Thank You Skorzeny,

Certainly looks like an Oerlikon. I’ll have to find out when they were made available to the RN in the Med.

Cheers
Spruso

Just received information that the photo thought to be PERTH is actually HMS YORK so please disregard my first post.
Thank you
Spruso

You’re welcome, Spruso.