This bike's serial number is WF 10685; located on underside of the BB shell. Shimano 105 cranks date KI September '86. I was told it was an '86 when I purchased it. Bike matches '87 catalogue except some changed components.

Edit note: per the serial date code is a 1986 model ; I have yet to see an '86 catalogue to verify, the '87 looks identical.