Shawn~ I don't have a clue as to who HD could be. However, it definitely is a spin off of a buckle set that Ethan Jacczak of Skyline silversmiths designed way back in the early 80's. In fact I think I have a copy of the original art work. I'll have to dig around and see if I can come up with it.
Shawn~ It is my opinion that Bob Berg is not fully original. I knew another silversmith/engraver by the name of Hugh Weaver that moved to Australia and helped Bob Berg build up his business there. When Bob Berg brought his business to America, An awful lot of his product already looked familiar to me. The fact of the matter is Bob was a better promoter and business man than Hugh Weaver. I haven't seen or talken to Hugh since the early 90's, but if I remember correctly, three of his biggest influences were Dan Murray, Mark Drain and Al Peccetti. Hugh's design work is equivalent and in some cases better than his mentors in my opinion. If you google his name and look hard enough you can track down some of jis work on the web.