Get out and ride it: It's what they're built for
Mark Rosenberg emailed me pictures of a 50 cm. Fuso he recently picked up on eBay. The previous owner had peeled the decals off for whatever reason so it was ugly, but this did mean he got it for a pretty low price. (See below.)
Mark opted to go for a $100 red powder coat paint job which only took a week to do; he built it up with parts he already had, and he was on the road. He reported to me that the bike was a nice ride, great handling, and quick, very stable. He added, great shock absorption, can't figure that one out. A good steel frame is like a very stiff spring, so it will absorb road shocks. At the same time when the rider makes a sudden effort it will give a little but then immediately transfer that energy to the back wheel.
It pleases me when I see one of my frames with the original paint and has been cared for. It pleases me when someone spends a good deal of money to restore a frame to its original glory. But I think what gives me the most satisfaction is when someone like Mark just rides it. It is what the frames were built for; the beauty is in the way the bike rides and handles, not just in aesthetics.