I believe it's meant for a G/K43. The mount looks to be a reproduction - maybe the scope too, but I'm not an expert on the ZF 4 scopes.
Correct on the mount.
Scope is recent repro from Meopta, which made the "dow" marked scopes during the war and the postwar ZF4 scopes for Czechoslovakia.
Wartime production of ZF4s might have been marked with the rifle type and serial number. "L" was used by Luftaffe on Fg42, maybe some G/k43s.
http://raskantik.com/galleri/samling/sam3/sam3.htm



















































