For years now, all I have seen was that the Bristol 32 was built in full keel with a cutaway forefoot, and centerboard models. There is hull #3 (1967), built as a custom model for Ted Hood, with a fin.
Project Intrepid Seas: Intrepid
The boat, named Intrepid, sails to this day, now in the Pacific and based in Japan. It has been retrofitted with an electric motor and is an ASA sail training vessel. Anyway, it was said to be the only fin keel Bristol 32. Now, another (1970, named Trumpeter) seems to have appeared:
1970 Bristol 32 Sail Boat For Sale - www.yachtworld.com