That may be my old cocker from way back... That serial number is ringing in my head.
Swift Line cockers, were nothing more then what would be called a "tuned" cocker... The guys name escapes me (Wolf13 you reading?) But it was some dude from up in Canada that would rework your trigger, timing and polish some bits as well as add a center detent... should be infront of the feed neck just before the breach opens up... its a little 10-32 screw.
Any way..... that guy from "Swift Line" Was the go to guy for cockers when they first came out, my cousin whom I got my first cocker from was a die hard supporter of him. His cocker and sniper both made trips to them atleast twiece.