Yup, I've got 3 treks. an 82 720/728, 84 460 and 88 2300 Composite, W/full Campagnolo package and traded a blue 500 for a 47 DX few year ago.
Dam nice bikes, I ride the 728 every day and if feeling speedy that 420 is kind of low in their books but, It's FAST! and only 19 pounds. my 2300 is too special to ride for the Composite; carbon fiber/Alu frame and especially campy parts but, it's super speedy too.
There's a caution on some of the early 80 bikes though, I think 83-5 forks, Japan cast, can micro crack under the crown and fail so, ya gotta keeps eyes on em. My 460 has the fork but it's fit as a fiddle.
Trek used Dupont's Imron paint and it's tough stuff!
There are three easy tips for collectible only desires. look for the brass badge that was discontinued about 86, the wrap around TREK sticker on seat post, discontinued about 82-3 and the oldest are brass badge with screws. Brass badge wit screws were the 1st Treks made, I think 1977- 79. . Badge wit screws prob the easiest guarantee that U Scored!
2300 full Campy W/Delta C-Record (most collectible) brakes