I picked up a shell casing marked 1.1 in 75 caliber MK1 dated 1943. Looks to be a US Navy round. I never seen one before and my guess its anti aircraft. I know the Navy used 20mm and 40mm. I remenber seeing a quad mount anti aircraft gun in early WW2 Navy footage and wonder if this is the round it uses? How rare are these? I'll post pictures sometimes this week.
Thanks,
Michael Hale
Thanks,
Michael Hale