If it's not a Parker, the Parker grade would not relate.
a quick google search found a pictue of an "N C Greenough" shotgun that had Birmingham proofs.
take a look on the underside of the barrels for marks like these
http://proofmarks.tripod.com/englishproofs.html
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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