Okay, Morgan, I give up. At first I thought I was looking at a brazed- up Rossin lug. Then I looked at 4 of my Rossins ('83 to '85), the ones with the R on that lug, and they're not like that. The R is in two separate segments; a vertical stroke and a reversed S-like swash. So what it/was it? it actually looks more "Rossin" than the Rossin lugs do.
Mark Fulton Redwood City California USA
PS: Two of my Rossins have pantographed shift levers and the Rs on them are like the one on the brazed-up lug.