Question about shell

Hi, can you tell me what kind of cartridge am I looking? Headstamp says 93h, Wa+, (stamp of the crown),42 Could it be ww2 german ammunition?

Needs dimensions to say for sure but I would wager 20x138B (“long Solothurn”).

In Finnish service, this ammunition was used in the Lahti L-39 AT rifle and L-40 anti-air cannon, as well as some German anti-air guns borrowed/purchased from Germany.