I do some computer work for a friend who is in the military antiques restoration business & from time to time he gives me the odd bit of kit that he gets as part of a bigger deal. I have been given a pistol that I would like to know more about, if anyone can help.

It's a 4.5mm BB pistol with a pnumatic spring that is a self loader, with a capacity of 10 to 12 BBs. The frame is metal with the top and grips being made of plastic. It shoots well & is quiet, so can be used in the house when you get board...

I can find a model number on it, so I would like to find out more about it:
- how old it is
- what model it is
- how much it is worth etc..

I have taken some pictures which will hopefully help. Thanks