Opinions on this carbine please..

[Matt108]

Not really Luger Guy more a Nihonto Japanese sword guy I do have one shooter grade Luger and I just acquired this but I am looking to trade it for a sword to a friend however I’m not sure of the value of this.

From what I gather is a vet brought this back and then had the stock in the four grip replaced in the 70s as well as having the box made. Only 2 numbers visable, stock has some wiggle to it. It’s 9mm.

I know enough to be dangerous and I can’t really find any examples other than the $10,000 ones out there on the Internet so any and all info or opinions would be appreciated!

Thanks in advance!

Matt