If Rolex decreased the power reserve to 48 hours…

[Commander C.]

Originally Posted by douglasf13

Constantly screwing that manual crown does wear the seals out more quickly, but, yeah, the screw down crown may mitigate the issue. With non-screw crown watches, like a Speedmaster, it’s a risk. Those watches are fine to swim with when new, but it gets riskier as the number of winds go up.

Yeah, that's the problem. With a reasonably accurate automatic watch, you can set it, screw down the crown, and leave the crown -- and seals -- alone for weeks at a time. With a manual-wind watch, screw-down crowns make less sense, because you have to unscrew the crown on likely a daily basis to wind the watch. This is inconvenient and puts wear on the seals. So, most manual-wind watches do not have screw-down crowns, which makes achieving water resistance more difficult. It can be done of course (I have a newish manual-wind watch with 100m of water resistance), but most watch makers wanting to create a watch that is reliably water resistant to 100m or more will take the path of an automatic (or quartz) watch with a screw-down crown.

[J!m]

Greater concern (in my opinion) is the threads of the crown and tube, which will wear faster on a daily wound watch v a monthly date corrected watch. The seals, if specified and installed properly, should easily last a couple years with no issues.

There are very specific dimensions and tolerances for manufacturing O-rings, as well as their grooves/pockets. And the latter is further dependent on the intended seal method: internal/external pressure; sliding/static/rotating... you don't just "throw an O-ring in there" and hope for the best...

[Chadridv]

to me the increased power reserve was a feature I didn't know I needed, or rather wanted.

I've really enjoyed taking off a watch on friday evening and returning to me case monday to see it running. It's a nice luxury that I don't think should be a difficult or premium feature for this brand.

To be honest, If they never changed it, I wouldn't have cared, but it seems like not only the next step in the right direction but should be standard for this market.

[Yobber76]

Originally Posted by Commander C.

The problem with hand-wound movements is that it is more difficult to achieve and maintain water resistance.

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The Panerai 915 is a hand wound 8 day power reserve watch that boasts 300metre water resistance. Seems to be possible.

[dannyp]

Originally Posted by Yobber76

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The Panerai 915 is a hand wound 8 day power reserve watch that boasts 300metre water resistance. Seems to be possible.

But that probably has something to do with Panerai's use of a leaver system to secure the crown, not a standard screw-in crown. No threads to wear out and also wondering if there's less gasket-on-metal friction from the winding with this setup?

[Yobber76]

Originally Posted by Yobber76

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The Panerai 915 is a hand wound 8 day power reserve watch that boasts 300metre water resistance. Seems to be possible.

Originally Posted by dannyp

But that probably has something to do with Panerai's use of a leaver system to secure the crown, not a standard screw-in crown. No threads to wear out and also wondering if there's less gasket-on-metal friction from the winding with this setup?

Maybe, but it is a hand wound submersible watch with very extended power reserve. Goal achieved. That was the issue. Plus it's a cool watch.

[GanymedeWA]

70 hours or no deal for me.