"Coquina ex-Avocet #965s was owned by Halsey Herreshoff in the 1960s and moored in Marblehead when he was studying at M.I.T. In 1960, during Hurricane Donna, she broke her mooring, went on the rocks and was severely damaged, neccessitating her restoration in Bristol by Halsey Herreshoff and his father, A. Sidney deW. Herreshoff. Coquina was sold to Briggs S. Cunningham in San Diego who later donated her back to the Herreshoff Marine Museum." (Source: van der Linde, Claas (based on info written on back of envelope containing photo of Coquina on the rocks in 1960). November 15, 2008.)
"Note that Kenneth B. Upham, in his 1994 "History and Register of the S Boats" is unable to assign a HMCo hull number to Coquina. He notes her to have been from the #996 class and lists her as "Puffin" in Marblehead in 1950, having previously part of the Sorrento fleet." (Source: van der Linde, Claas. November 15, 2008.)
I just checked - no plate on Coquina, but the screws are there so I imagine it is in the collection - somewhere....
Halsey hopes to restore Coquina and perhaps another of the Museum's S-boats in the coming years.