My local gun store called

[OH Osthaus]

Some good photos would help a lot

take a look at the links for grade identification from the home page - and you should be able to tell us the grade of the Parker

also - what does it say on the top rib?

you have three features that are not the norm, not rare - but makes me wonder if the gun has been altered -- a recoil pad, the beaver tail forend and slightly more common 26 inch barrels.

any of them could have been ordered as options, but all on one gun might be less than common. the letter should tell you if they are factory, a good clear picture of the rib and muzzle ends of the barrels may tell us if they have been bobbed