Originally Posted by francophile

FYI only, the reason I'm saying this is a '91 is because of the Y### under the bottom bracket. This started in the mid-80s IIRC and normally follows the format of YABB where A = the second digit of the year (6 = 86, 1 = 91 in this case I think) and BB = the month of manufacture. Depending on what original hardware is still on the bike, you could possibly confirm that by looking up the date codes on assorted pieces of hardware..