I have a set of wheel which I had built in 1980 or so... Campy NR hubs, Ambrosio Elite Durex rims, DT spokes. I had never had any problems with these wheels until I changed tires about 5 years ago, and started getting flats quite often. The punctures were always on the rim side of the tube.
The rim tape was 10 or 11mm Velox. I started riding another set of wheels so had not messed with these since then. I wanted to use some wider tires (700x28) so decided to give these another shot. I replaced the rim strip with the same new Velox. In 6 rides, so far, I've had 2 flats, one the first ride. Here is the location of today's flat:
Here is some 17mm Velox on the rim. Seems too wide: