^^^^what he said, listen to the man^^^^
I have TX-700 I purchased from gomango and it's full Reynolds 531 with Campy dropouts. I'm slowly compiling the 1st-gen black Dura Ace parts I need to finish up the build and am only lacking a headset, hubset, and brake levers to finish the build. I've got a very nice 27" wheelset with 1st-gen silver DA hubs, but those black hubs and components on a gold frame will really sparkle!! I've had three of my listed early Treks professionally repainted with full restoration decals and to me they're priceless, so even if the one you're looking at needs a full repaint you can enjoy the ride while saving up the $$$ to ship it off to Joe Bell or Chris Kvale or Matt Assenmacher or any of a number of great bike painters. If you haven't already done so, try to get the serial number and go from there. Has an asking price been mentioned?