I suspect it is a sleeved gun which has been poorly restocked. The barrels with that top rib just looks poor. You can get anything stamped or engraved on a rib. Unless this is a old low grade gun that was later upgraded by a owner to try to look like a better grade gun I suspect a fake. Even then it is still a fake upgrade. The engraving is not top level which you would expect on a Purdey but that may just be due to wear, age or poor maintenance. Bad example of a good name at best. Unless it is for sale at a bargain price I would keep looking.
