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It was, actually it was anchored off Sausalito. He must be working his way down the coast. Supposedly the "A" name is the reference to both his and his wife's first initial, although perhaps some of the alternative meanings mentioned could apply too.
I was on a 5 day motorcycle trip and took this picture from Sausalito on 8/23. I wondered what it was... Interesting that I find out on Rennlist!