I'd built 700c clinchers for that bike and I wouldn't sweat using a modern, quality rim that would look right on a vintage bike like the H plus son TB 14:

TB14 | H PLUS SON

If I were looking for vintage rims, I'd get the Mavic MA 2s. Before I pay good money for a vintage rim, I'd hunt around for a decent period correct clincher wheelset. They're out there. Used rims are a bit of a crap shoot and NOS vintage rims are expensive.