I am the current owner of the Dolphin 24 PORPOISE, and a member of the Wilmette Dolphin fleet Nancy Broeckl bought the boat in 1992 from C. Paul Cox of Easton, Maryland. I became a co-owner when she bought the boat.
When I was crew at a Penguin Regatta several years on the Chesapeake C. Paul Cox II was a competitor and ran the regatta. He explained he grew up on PORPOISE, so his father may have been the original owner. I know it was cruised extensively by the Coxes.
The boat is an O'Day Dolphin, built by Marscot Plastics, Fall River, MA. Hull No. 3235, Class #15 in 1960. The boat has been kept in Belmont Harbor, Chicago since acquired here. Nancy Broeckl is a member of Chicago Yacht Club, which has a Belmont Station, and is their historian.
The boat has been day sailed from the harbor and has never raced at Wilmette or locally. Nancy has not done much cruising, but sailed for a few weeks on the ketch Yankee one summer when we were on the Canal du Midi in Southern France, with Irving and Exy Johnson. I had sailed with them in a circumnavigation on the brigantine Yankee, and then on numerous short cruises in European waters..
I hope this helps in your history of the boat, which I enjoy sailing on Lake Michigan.
Terry Glenn