back when I worked at trek in '77-'78, every bike was custom. And when I say that, I mean we built standard geometry frames, and then a couple guys did braze-ons to the customer's order.

I don't remember custom colors though, when I got my frames painted it was one of their standard colors because they had an incredible deal for us if we did that, I'm remembering $18. I don't remember what the deal was on bikes, they were quite generous. The one I remember building didn't have Trek decals or headbadge though.

The 900 above is a bit of an oddball since it doesn't have fastback stays. The vintage trek site says they had trouble with those, and although I don't remember any such problems, I observed some people having problems with them.