Need help identifying antique ammo


I was given a few rounds from a customer and was wondering if someone could help me identify them


1st - 20mm Hispano cannon round - manufactured by B.M.A.R.C - British Manufacturing And Research Company (a ‘front’ company that eventually fell foul of HMG) If this case is fitted with a projectile, it could quite possibly be HE filled and needs to be dealt with accordingly.

2nd - 15mm BESA (British) Armour Piercing - manufactured by Kynoch.

3rd - Cartridge S.A, ball .50 inch Browning Mark Iz - manufactured by Remington for a British contract for RAF use in American aircraft purchased in 1940.