"For readily available current clincher rims that would not look out of place with CR time frame hubs these might deserve a look. http://www.velo-orange.com/vopari.html And as a more expensive alternative: http://www.vintagebicyclepress.com/Handlebars.html (Scroll down to rims) I have not tried building with either of these rims, but both companies are well regarded. With a couple of misleading repro stickers, the casual glance of even an expert might be fooled. Not that I am condoning such a misrepresentation."
I have built wheels with both of these rims. The Velo Orange is a slightly more modern take on the Mavic MA-2. It is a double wall, single eyelet rim, brightly polished, but noticably deeper in cross section than the MA - 2. The wheels built well, to a pretty high and even tension. I would not hesitate to recommend these as rider rims for a classic bike from the early '70s on.
I built a few of the Grand Bois rims that are copies of the Super Champion No. 58. The look is closer to vintage than the VO rims. I no longer do business with Jan Heine, so have no further comment.
Earle Young Madison, Wisconsin Offering expert wheelbuilding service for classic and modern bicycles