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Marty Henry Yep 3.7cm Flak 18, first of that series. My uncle brought them back with him after the war. He probably had a few close encounters with these as he was a wireless operator air gunner...

You are on the right track, but bigger.

Digressing a little from unusual old ammo, how about these old shell cases... Anyone care to have a guess? Hints are, WWII and they were used against our airmen. That's a 260 case in the middle for...

I've got some Kynoch 7x57 ammo too, the big old 173gr round nose, came with BSA Hunter I bought years ago and kept it out of interest. Also got given a jar full of different ammo too, in it was 7x61...