I doubt that it's any kind of official release. Most likely it's something someone taped and has probably been circulating amongst the traders. Without the lineage it would be hard to tell if it's an actual series of concerts or excerpts from Airplane shows. 1969 was the year that resulted in the official formation (or, at least naming) of Hot Tuna. I've got a friend who was in San Francisco around that time. I won't see him until next week, but I'll ask him if he knows anything about it. If all goes well I'll be seeing Jorma at the end of March. I'll ask him, if I remember.