>I'm curious - do we know when the left side guide tang appeared and when it disappeared? I want to say it's a late 60s to about 1971 thing, but that's just a very unscientific guess ...
I'll add some more data for the scientists. My Gitane TdF had the "finger" on its forged Simplex nondrive dropout, and it was a '70 or '71 model (bought in '71 but likely built in '70 if nor earlier, IIRC).
Alan Goldsworthy
SF, CA, USA