grade 5 trojan?

[Pa SxS]

All the engraving and stock work would be after market upgrades. There was no such thing as a B grade Trojan or any other grade Trojan. Trojan is the grade.

All Parker receivers regardless of model were color case hardened, never blued.

I suggest you study this web site to learn more about Parker shotguns and how to tell what is original and what is not. It's a learning experience but well worth it on future purchases. The experts you asked for advice weren't very expert!