You'll need to give us a bit more information. Does she have a hull number? Do you have any pictures? How is she rigged?
The obvious question is: Herreshoff, 1926, and San Diego don't typically go together. If it is an HMC boat, it would not have been built in San Diego. It could be an S-Boat (27 feet) or a 15-footer (25 feet). Or maybe it could be an L. Francis Herreshoff design?