RMack . . .
Interesting to get this info from you . . .
To my knowledge, Harry Mason was not an SO member . . . . he told me while we were at FSO as public that he had bought and personally owned the Diana after it had been sold off by the Cherch . . . . and then, subsequently had returned it to them.
I had lots of dealings with him, even hosting him in NYC in around 1981-2.
Your description of him is apt. Though he, like all "operators" (umm, con-men) he could appear nice to those he wanted to either impress or get something from . . . . but he was all "meeee . . . I want, and am the rightest thing in the universe."
One of the things I must plead guilty to is being rather too trusting of "fellow OTs" . . . it's like, when you are cultized you believe the propaganda . . . particularly if you yourself are decent.
Harry, was indeed an "operator" . . . in 1981 he was touting an investment in a computer software system that could analyze Landstat satellite data for recognizing fault lines amenable for gold or other metallic deposits . . . particularly in Oz.
While at Flag, on the subject of yachting, I revealed to him my invention of cambering the keels of racing yachts . . . this to offset the force of the wind in the sails such that the yacht would stay more upright and not lose wind power due to slippage caused by the lean. Harry lit up on this concept.
I had been planning to introduce it to the yachting world after I got shot of Flag service . . . next I heard was Harry in Oz and the invention being put to work out there!!!

It's a standard feature in the big and best ocean racing yachts now days.
Of course, investment in his gold mining venture went south . . . Harry had expenses, of course

Ya, Harry is now dead . . . living life the way he and Hubbard did tends to take you down in ways that are unpleasant.
Hopefully, my post fills in a little bit of information you can benefit from, Rmack . . . if Harry told you or led you to believe he was SO . . . . he was bullshitting you.
Rog