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Hi Motiztab
You have a 20 mm Hispano case as per the date and made by (do not have references handy at the moment so will have to go by memory :hmmmm2 Bethlehem Brass Company in America, sure the others will correct me if I am wrong.
The Hipsano rounds are very likely to have come from an aircraft mounted cannon/s.
The other case is also a 20 mm but from an Oerlikon gun as you can see the letters Oez stamped into the base-these rounds are most likely fired from a deck mounted gun.
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