British 3.7in AA gun AP projectile

[Vasco Da Gama]

Pictured is what I believe is an AP-T projectile for the British WW2 3.7in anti-aircraft gun. The projectile does not have any stamped markings on the body, which is unusual for British projectiles. Diameter of base is 93.6mm, the driving band is 37mm wide and the tracer pocket is 13mm in diameter. The weight of the projectile is 28lbs which I understand to be correct for the 3.7in AA. I have included a picture of the 3.7in alongside a 25pdr AP projectile for comparison. It is not a US 90mm round as it does not fit in the M19 cartridge case, I have tried! It also has a different driving band to the US projectiles and is not stamped within the driving band as is common on US projectiles. Glad to have the learned views as I have not come across one of these before.

 

[HAZORD]

The U.S. didn't stamp numbers on rotating bands on projectiles larger than 37mm.

 

[Vasco Da Gama]

Thanks Hazord, not sure if that policy was followed completely. I have 76mm APCBC and the 90mm T33 AP projectiles which are stamped in the copper driving band.