Originally Posted by
molleraj
OK, we have codes and pictures now! 2 and 150 on the Sugino Idol cranks, FB (1981 February?) on the 3S hub, and 5353 FK on the front hub. Probably a 1981 or 1982 model?
Thank-you for the additional photographs. Based on other Idol crankarms that I've seen, the "2" is the mould/cavity number and not a date code. However, those are February 1981 and November 1981 date codes on the hubs, which fits with the original 1981 interpretation of the serial number. However, November is so late in the calendar year that it should be a 1982 model year bicycle.