Originally Posted by
Trinidor
Just got a very cool Custom Sport and am having trouble dating it. Here is a pic of the only numbers I can find on the underside of the bottom bracket. Any help appreciated. BTW, it's a 12 speed with Suntour AR derailleurs and Suntour stem shifters, with Sugino RT cranks.
The last alpha character is a 'C', which means it was manufactured in 1983. This is also consistent with SunTour AR, which was produced circa 1982-1986.