TOPSCORE 175 B-B GUN ?????

[:0]HELP, got this TOPSCORE 175 B-B gun in the shop today, and I don't know anything about it. I've seen a lot of B-B guns in my past, but not like this one. It looks like a Colt woodsman/High standard with a bit of luger, You cock it by pulling the top half of the gun upwards until cocked and then return to frame and lock with a locking lever to fire. While barrel is in UP position, you lift a trap door shute on barrel to insert B-Bs. The darn little thing works!! ANY help on this THANK YOU[?] PS: Thanks to EVERYBODY for all the OTHER information you have help me with in the PAST