You've got a British 25 Pounder Field Gun Casing there...the 37mm looks British or US...
The 37mm ones are American. The other is British 25 pounder field gun.
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thanks very much for the replies!!!!!!
Hey patriot nice shells.I can imagine that you bought them from the flea market at Monastiraki
Keep your eyes open then 'cause there are many overpriced and fake items
hehe dont worry