No idea, I spent hours trying to identify a pewter spoon handle I found in my backyard, it was stamped with just an “R” very heavy and in good shape. I think you’re on the right track, try a few google searches, that worked ok for me, I narrowed mine down but couldn’t be 100% positive. This like this drive me crazy, I’m sure I’ll try again during the long, dark, cold, seemingly endless winter months��
Tommy, you’re invited out to Massachusetts anytime you want, my buddy has a home built in 1750 I have free rein on, tons of iron, but good relics to be had!!