Note: "I would like to contribute to your project, as I have a Rolex 1655 Explorer with the serial number 6,34x,xxx:
Model 1655 Explorer II
Bracelet 78360 with endlinks 580
Dial is Mark IV and bezel mark 3.
Original dial and Original hands.
On one side between the lugs the case indicate the Serial number + Stainless steel on the other side 1655 only.
There is no mention at all of "Original Rolex Design" as mentioned in one Orchi post with a 16750.
The watch is 100% original and I bought it in a German shop with Original box and Paper. Watch has never been serviced.