What type of gun is it? Is it a pump, semiauto, boltaction.....
and what other make gun is it patterned after? Sears did not manufacture any guns, they were mostly made by winchester. If it is a winchester manufactured gun, just deduct about 25% from the one with Win. name on it.

If you don't know the "clone" just describe it and we should be able to help you.

Dave in WV, Dryridge