They'd build the next year's model year at the end of the previous season- similar to cars ("the new Oldsmobiles are out early this year") If a previous model year bike was still at Trek, it'd be painted and decaled as the current model year.
All the 1984/85 Trek 720s were brazed in 84. It wasn't a big seller (as it was an EXPENSIVE bike), whatever 720s didn't sell in 84- they changed the decals to the 1985 version.
It's interesting seeing the 1986 Trek 620 Cirrus. There was no Trek 620 for 1986- but they had leftover frames- so they were done up with 1986 paint and decals (with the "cirrus" decal from the 520) and called the 620 Cirrus.
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*Recipient of the 2006 Time Magazine "Person Of The Year" Award*
Commence to jigglin’ huh?!?!
"But hey, always love to hear from opinionated amateurs." -says some guy to Mr. Marshall.