I know this is an old thread, but I've just been re-looking at my Tortoiseshell Fish vases, and have noticed that the ones with these big triangular wings often have
double wing casings and
double crossover straps.
I can't quite make out from your pics if your Fish does or not, David. Any chance you might be able to tell me?
Since this thread was written, it has come to light that there was at least one other well-known and experienced maker working at Mdina during this period, Jim Munnelly. And we now know that Vicente Boffo stayed at Mdina until '77. (thanks to Wolfie.)
see next post for a correction!