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Old 22 November 2012, 06:24 AM   #1
timuS
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Interchangeable Casebacks?

I know this has been asked once before, but I was really curious to know whether the casebacks of a Submariner Ceramic 116610 and a GMT IIC 116710 are interchangeable?
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Old 24 November 2012, 06:39 AM   #2
NYCrussino
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They both have the same case size so I don't see why not? But I'm no expert.
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Old 24 November 2012, 01:27 PM   #3
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Originally Posted by timuS View Post
I know this has been asked once before, but I was really curious to know whether the casebacks of a Submariner Ceramic 116610 and a GMT IIC 116710 are interchangeable?
They may physically interchange, (I have not tried it, but they do have the same threads) but they are not the same..

The Sub case-back is almost half again as thickas the GMT, and the back of the Sub case is machined flatter while the GMT IIc is recessed slightly and so fits flatter on the wrist..
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Old 24 November 2012, 02:10 PM   #4
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Why would anyone want to swap casebacks?
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Old 24 November 2012, 03:40 PM   #5
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Quote:
Originally Posted by Tools View Post
They may physically interchange, (I have not tried it, but they do have the same threads) but they are not the same..

The Sub case-back is almost half again as thick and the back of the Sub case is machined flatter while the GMT IIc is recessed slightly and so fits flatter on the wrist..
Thanks Larry for this data! If the thickness is only on the outside of the caseback then it would probably not be an issue.

But if the extra thickness is also on the inside of the Sub's caseback, and this was to be screwed to the GMT's case, the gap between the 3186 rotor and the caseback would reduce. Then, is it not possible that the GMT II 3186's rotor would touch the caseback?

Given the varying heights of both GMT's and Sub's cases, I am guessing (experts, please correct me!) that the Sub's case compensates for this caseback thickness in some way...
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Old 24 November 2012, 03:51 PM   #6
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Why would anyone want to swap casebacks?
Since most of the other things such as the crystal thickness, triplock-crown and probably the gaskets are the same across the GMT IIC and the Sub C, the only thing that allows the Sub to withstand greater water pressure is its extra thick caseback. So I was wondering whether it is actually possible to make the GMT IIC more water resistant by swapping a Sub's caseback onto it...
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Old 24 November 2012, 04:19 PM   #7
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Originally Posted by timuS View Post
Since most of the other things such as the crystal thickness, triplock-crown and probably the gaskets are the same across the GMT IIC and the Sub C, the only thing that allows the Sub to withstand greater water pressure is its extra thick caseback. So I was wondering whether it is actually possible to make the GMT IIC more water resistant by swapping a Sub's caseback onto it...
interesting approach...
i would probably just swap the Sub for the GMT?

seriously, do you have occasions to need greater diving depths?

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Old 24 November 2012, 06:07 PM   #8
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interesting approach...
i would probably just swap the Sub for the GMT?

seriously, do you have occasions to need greater diving depths?

Haha...True!! ...But its that WIS thingy - more the merrier!!
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Old 24 November 2012, 06:09 PM   #9
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The caseback is integral to water resistance and pressure. The Sub is indeed much thicker
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Old 29 November 2012, 02:48 AM   #10
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Quote:
Originally Posted by timuS View Post
Since most of the other things such as the crystal thickness, triplock-crown and probably the gaskets are the same across the GMT IIC and the Sub C, the only thing that allows the Sub to withstand greater water pressure is its extra thick caseback. So I was wondering whether it is actually possible to make the GMT IIC more water resistant by swapping a Sub's caseback onto it...
This may be true - although the Sub case back may contact the movement on a GMT, since the GMT case has a slight recess to it..

However, at 100 meters, the GMT is already more waterproof than any person wearing one can physically free or scuba dive to..
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Old 10 December 2012, 03:40 AM   #11
timuS
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Thanks guys for all the replies!

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However, at 100 meters, the GMT is already more waterproof than any person wearing one can physically free or scuba dive to..
Absolutely agree to this!! That's why I have always felt that the GMT II and Explorer II are amongst the most versatile rolexes out there!
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Old 11 December 2012, 08:43 AM   #12
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Originally Posted by timuS View Post
Since most of the other things such as the crystal thickness, triplock-crown and probably the gaskets are the same across the GMT IIC and the Sub C, the only thing that allows the Sub to withstand greater water pressure is its extra thick caseback. So I was wondering whether it is actually possible to make the GMT IIC more water resistant by swapping a Sub's caseback onto it...
Or make the Sub thinner by putting a GMT IIC caseback on it!
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