Joined: Jan 2008
Posts: 23,642
Likes: 1,106
From: Mans of NC & SW UT Desert
Bikes: 86 Katakura Silk, 87 Prologue X2, 88 Cimarron LE, 1975 Sekai 4000 Professional, 73 Paramount, plus more
+1 Date codes are the ticket. Most components will have codes: from the brake calipers to the derailleurs to the crank arms, to the handlebars, stem and seat post. Just figure out what you think is likely to be original, add about six months to the code, and you are there.
Codes are found at the vintage Trek site. And yes, I know this bike is not a Trek.