1936 Krieghoff

[spangy]

Originally Posted by sdmark777

but did appear to be matching except the magazine which is unmarked and appears to be messed with. --- Had a hold open, but it did not function.

A 'messed with' magazine is a good reason why a hold open doesn't function.
I suggest trying the hold open with another mag ... perhaps a new MecGar if you have one available. This could tell you a lot about whether the hold open is in need of work ... IMO I suspect the magazine is the real problem and this simple test will tell you a lot.
Looking at the mag images it definitely looks 'messed with' and in need of GT's attention

JMHO ... don't shoot the messenger ... just trying to help.