Originally Posted by
JohnDThompson
I believe one of them is 130mm BCD and the other is 110mm BCD. Otherwise quite similar "melt-forged" (i.e. "cast") arms with minimal finishing work.
That information is accurate as far as I know. I have one of each. I'm travelling now so I can't go look but I recall that that the 130 BCD is marked SX like the one posted by khatful and the 110BCD is marked SA. The left crank arms look the same and interchange, which I did to put the nicer arm on the nicer bike.
I like these cranksets because they are a vintage triple crankset that looks at home on the bikes I've installed them on, my '78 Motobecane Grand Jubilé and the '82 FrankenVega Viva Touring that I'm building up.