I have always been a fan of the original Blancpain Fifty-Fathoms, and it's historic importance to the development of the modern dive watch. From this watch sprang the military TR-900, the BP MilSpec and other really important watches.
On Ebay, right now, is an even MORE obscure watch whose DNA is linked to the Stingray and the TR-1000, and its unlikely you'll see another, so take a look at this Bulova which has come up for sale:
While missing its original bezel - which looks identical to the bezel and insert found on the MkII Stingrays, this watch's story shares alot of the back-story that led to the development of Alan Tornek's TR-900 as the successful bidder for the US Military contract for the diving watch it sought in the 1950s
I know I tend to post info that is a little obscure sometimes, but I think its this kind of color and historical context that makes Bill's homages to these early designs all the more impressive. Enjoy!