Since we know there are only 2 X Proto DSS prepared by Rolex for the 1953 to 3.150 meter dive by comparing the hight of the glasses of No 1, No 3 and No 5 we can now come to the conclusion that DSS No 1 (+ No 2) was made for the 1953 dive with a much LOWER glass, lets call it the DSS mk1, then from the DSS No 3 and No 5, that logically got updated by Rolex engineers AFTER 1953 with the much HIGHER glass to withstand the new challenge for 1960, to a depth of 10.908 meters. This last Proto DSS or MK2 became the example to replicate for the later DSS Displays, that started with No 9.



Conclusion: The DSS No 1 has been to 3.150 meter in 1953 and not to 10.908 meter in 1960 & From DSS No 3 it's possible to withstand the extreme pressure of Challenger Deep Piccard & Walsh managed in '60.