I guess I'll bump my own thread up since I have a new detail...

Now that winter is upon us, I've had some time to start stripping it down to the frame. Directly underneath the Reynolds 531 sticker is a separate sticker that reads "Cadre Derycke" with a picture of a bicycle. Some google searching yielded a French language listing of bike shops in Brussels including one "Cycle Derycke." Anyone from Belgium know anything more?

Also, there's an interesting braze-on for the shifters. The shifters are Shimano 600 downtube clamp-ons, but there is an eyelet brazed onto the downtube that serves as a guide for the clamp-on bolt. I'll try to grab a picture, but I've never seen anything like that before.

The frame is in pretty bad shape, so I am toying with repainting it or getting it powdercoated. That might be more money than I want to put into it, though.