Certainly a member of the sugar Havemeyer family. H.O. Havemeyer was a good customer of HMCo, having ordered #530s Electra, #545s Pleasure, #550s Toby, #582s Electra, and #607s The Flight over the years.
#530s Electra and apparently also #582s Electra were specifically designed for sailing on Great South Bay. Likewise, #607s The Flight, was very shallow and probably designed for Great South Bay. And #550s Toby was the shallow-draft Buzzards Bay 15 built by HMCo, suggesting that she was built for Great South Bay, too.