need quick answer

[charlie cleveland]

i hope some one can answer this question. about what grade of gun would a forearm release be off ofthat is completely covered in engravings.i have looked up to the B grade but it is above this grade of gun.im talking about the small release at end of forearm.appears to be off a truly high grade gun have never seen so much engraving on the release part before.the parker books do not show the release piece good enough totell what grade of gun its off of either.this pieace im talking about is the one you stick finger under to pull forearm off. it is off parker brothers gun. thanks charlie