My uncle, Tom Manning, was an active ham radio operator from after WW II until his untimely death in 1955. Or, I think that year is about right, he was a radio operator on a merchant marine ship during the early 1950s as well as being a ham radio operator with a California '6' call sign.
Unfortunately, none of his siblings who are still alive (and, all in the mid-80s in age) can remember his call sign.
As a young kid, I remember his ham shack and the boxes of electronic gear on the floor. I also remember his antenna and I remember the wide glass insulator ladder line that he fed his wire antenna with. That is about all I remember.
He lived in San Jose, California.