My first instinct was to think of the 3646 and 6152. The more I think about it, the more I realize that the history some of my modern pieces have with me plays a bigger part in how I define Panerai DNA.
My first Panerai was a 177. I simply liked the way it looked and felt on the wrist. As many of us have, I found myself picking up others and trading a few as time went on. Today I wish I would have kept those early pieces in the watch box because I’ve learned over the years that the more experiences I have with specific pieces, the more special they become.
My 232 carries a lot of personal history with me and some would say it carries a lot of Panerai DNA. As I think about your question, maybe 10 years from now, the 42mm gold sub will evoke the same feelings and connection to OP’s history that my 232 does today. ...guess I’ll have to buy that 684 to find out.