Do they still have a legible label?
When the first high pressure, narrow clinchers came out, Rigida was one of the first companies to make a compatible rim - their "13-19" model (red label). There were some reports of incompatibilities with certain tires and they replaced that model with the slightly wider "13-20" (blue label). I used a pair of the 13-19s in the 27" size to rebuild the wheels on my Gitane Interclub that had come with tubular wheels. Still have the rear wheel - the rim on the front eventually wore out on the braking surface so it was rebuilt with a different rim (but still the original hubs and spokes from the tubular wheel).

I had no complaints about these Rigida rims - they stayed true and worked well with all the tires I put on them over the years.