Aha - Once upon a time was a chap in the Seattle 'burbs with a
special interest in Seixas. Ray Izumi by name; mainly a guitar
player and chasing that aspect of the music, but he acquired a
largish Italianate instrument to further.
I've lost track of him, but there appear to be multiple Web mentions
both of his connection to the music and to some interesting-sounding
marine biology. I seem to recall that he was the sort of chap who
would know every possible recording - so if you can find him, he
might be the authority you seek.