BESA 7.92mm ammo and belt
Looks to be for the 7.92mm BESA armoured vehicle machinegun. British ww2. The Brits called their version of the 8mm Mauser cartridge "7.92mm". Identical to the German 7.9mm cartridge, except for markings and other minor details. In the USA, we just call it 8mm Mauser. I've put a lot of it down range with my 34.