Hi CMWill,

Welcome on board.
I searched for JJ Reeb and found only this
jones

I wonder if there is no name's mispelling. Are You really sure of the name J. J. REEB

It might be a German or Austrian Gunsmith, anyway a small manufacturer.
BTW, here in Saverne, the closest gunsmith is J J SIPP.???

I am searching on.
jb