47-11 and 47-9 on the back of the crank arms. I haven't been able to find much on the C Itoh Tripping online (I'm impressed by your knowledge!), do you know if it has any specs of interest?
Originally Posted by
T-Mar
I guess that could be the S/N or at least part of it. It sounds incomplete. My next dating tool would be component codes. The Sugino Maxy crankset is era correct and is likely OEM. It should be old enough to be using the Japanese Imperial Calendar, so the codes should look like 4x-(x)x, where x is a number. There should be a date code on the back of each crankarm.