Originally Posted by
John E
S/N 9103143 = 1979 vintage, right? 7 digits = 1970s, leading digit = year (see signature for my 1970 UO-8, below).
(My 1980 PKN-10 S/N started B0 ... I don't recall the rest offhand -- I'll have to ask my son, since it is his now.)
Since yours has a letter near the front of the S/N, I suspect early 1980s, as well.
Here are the serial of the frame and original broken “death” stem. Since the stem was stamped in December 1980 and the frame has a B0 starting the serial number, along with the color scheme and components, I’m dating my bike to 1981 or possibly early 1982.
