I don't have a clue. The price indicated it was something other than a standard A grade. The weight, if correctly described, would indicate a special gun. Of course, the stamped or engraved "SPECIAL" may indicate that the gun had "been to Pennsylvania", a phrase that Fox collectors understand. A AHFCA letter would clear things up, maybe. A frame measurement is basic and would definitely clear things up. If the new owner would PM, maybe some assistance would be forthcoming.