I wouldn't use Araya if you are looking for something proper for a British lightweight. I am also in love with Sun rims, but I wouldn't put them on a vintage bike. My recommendation is to go with Super Champions. The Modele 58 is a clincher, is aluminum, eyeleted, and goes back as far as the early '70's. The Super Champion Gentleman is a little lighter. You want 40H in the rear and 32H in the front.
Be careful of front dropout width and hub axle diameter, which is probably 95mm and 5/16" (8mm), respectively.
The Super Champions were made in great numbers, so some of them, to this day, can be found N.O.S. Cupertino Bike Shop has some 32H, and I have seen some (Wolber) Super Champion 40H on Ebay for a reasonable price.
If you are looking for as light as can-be, then you will want to go tubular, and Raleigh Katsaris has a nice, N.O.S pair of Birmalux Sprint rims. These would be appropriate for your build. If you really want a period look (actually about 10 years prior), then hold out for a set of Constrictor Asp rims. These alloy rims will probably be hard to find and expensive. Your only other option for period-and-place-correct are the Dunlop Special Lightweights. These are steel, British rims that were used on a lot of lightweights from the 50's to the 70's. I do not know their weight, though. Which marque, model and year is your frame?
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Last edited by 1989Pre; 07-31-20 at 11:50 AM.