The best I can do from Fjestad's Blue Book is a Model 12C. "Similar to Model 12(22" bbl.), except 24" oct. barrel." 95%=$375,98%=$475. "Add premiums for Grades D,E and F." But it doesn't say what they are.
Okay, for background, the Standard Catalog '99 says the 12D Peerless has light engraving(VG=$1750), the 12E is called the Expert(VG=$2250) and the 12F Premier is heavily engraved(VG=$2250). No mention of a pistol-grip stock anywhere. John