I have a very old looking pellet rifle, with the brand name Pleasure. Cant find anything on it. Is it rare?

I got this pellet rifle a good while ago. The metal latch that lock the barrel in place is now missing, and I cannot find a replacement. The name "Pleasure" and a few oriental characters are inscribed on the barrel. It is a break-barrel .177 cal pellet rifle. (All wood and metal, no plastic.) Does anyone know anything about this gun?