Welcome Doc - The Herreshoff Registry mostly deals with documenting and discussing the yachts that were built by the Herreshoff Manufacturing Company (HMCo.)- and are primarily designs of Nathanael Greene Herreshoff (NGH). The Prudence was designed by his Son - Lewis Francis Herreshoff - and was never built by HMCo. It was designed in 1937 (his design #71) and was published in the old Rudder Magazine as an open design - so there have been many builders over the decades since.
With that said, this forum is open to discuss just about any Herreshoff designed craft of any generation (there are at least 4 generations of Herreshoff designers) - as well as just about any other craft that tickles your fancy - so this forum is as good a place as any to ask questions!
An excellent source for info on the Prudence is LFH's book Sensible Cruising Designs (Pub. 1973) where she is prominently featured.