I am sure that dropout had that addition brazed in place as I have never seen one stock that way. Still you people would know more about that than I . I was struck by looking at the number of washer indentation rings on the dropouts. It looks like a rear wheel was moved in that dropout once a month for its lifetime. I look at all those rings and wonder if you could sort of guage the age of the bike like counting rings on the inside of a tree.
Ray Homiski
Elizabeth, NJ