I wrote to Tony Hyman of the Cigar History Museum web site featured in Cigar Magazine every issue. Here's what he had to say:
"They're R.G. Dun Palmas originally made by D.W.G. I suspect but don't know for sure that they had been bought up by some even bigger fish by the late 60's. If you post my info credit me and the National Cigar History Museum: www.CigarHistory.info"