Need information about a AJACK 5x from stalingrad

[overlord06]

Hi,
I just received a Ajack 5x serial number (10179) from the battle of stalingrad. I cant find information about the Ajack 5x.. The scoope is now just a relic but Its a 100% artefact from this battle. I have heard a lot from the 4x90 but nothing about this one. Someone have informations about this one? Thanks

[overlord06]

Maybe a scope from the late 20 or early 30. Someone have hint?