Sinn crowns

Discussion of Sinn watches.
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hoppyjr
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Sinn crowns

Post by hoppyjr » Mon Apr 23, 2018 9:30 am

I was curious about the crown sealing on the EZM 9, 1.1, and U1, so I asked Sinn. We know the Rolex Triplock uses 5 gaskets, but Sinn advised they use 3; one in the crown and two in the tube. This seems better than many brands as most use only one. In fact, the Grand Seiko divers only use a single gasket (as per Grand Seiko service).

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Panerai7
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Re: Sinn crowns

Post by Panerai7 » Mon Apr 23, 2018 10:24 am

Wonder what JLC uses in their non-screwdown crowns Polaris to achieve 200M WR

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Re: Sinn crowns

Post by spring-diver » Mon Apr 23, 2018 10:24 am

That’s good info Ed.




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hoppyjr
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Re: Sinn crowns

Post by hoppyjr » Mon Apr 23, 2018 10:33 am

Panerai7 wrote:Wonder what JLC uses in their non-screwdown crowns Polaris to achieve 200M WR
My guess is a single o-ring in the tube, maybe two.


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dnslater
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Re: Sinn crowns

Post by dnslater » Mon Apr 23, 2018 11:48 am

Good info Ed! U1 is designed for 1000+ meters of WR, so it doesn't surprise me that the crown tube design is better than a Seiko diver designed for 200-300m. Once they designed a 1000m crown and crown tube,they likely just used the same on on the other EZM watches.

German's love to do overkill on design. Damasko puts a 3 gasket, self lubricating screw-in crown system on their 100m Pilot watches. I'm assuming the only reason they aren't rated for higher WR is because they use a thinner crystal to keep the watch at 12mm thick.
http://www.damasko-watches.com/us/crown
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hoppyjr
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Re: Sinn crowns

Post by hoppyjr » Mon Apr 23, 2018 11:51 am

Love the German engineering.

Lube! :excited: :love: :jerk:

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bedlam
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Re: Sinn crowns

Post by bedlam » Wed Apr 25, 2018 1:50 am

hoppyjr wrote:
Mon Apr 23, 2018 9:30 am
I was curious about the crown sealing on the EZM 9, 1.1, and U1, so I asked Sinn. We know the Rolex Triplock uses 5 gaskets, but Sinn advised they use 3; one in the crown and two in the tube. This seems better than many brands as most use only one. In fact, the Grand Seiko divers only use a single gasket (as per Grand Seiko service).
There is a cultural difference playing out here though. Efficiency is seen as elegant and desirable in Japanese culture. From that perspective Rolex needing 5 seals to achieve what Seiko engineers achieve with 1 isn't better.

In all my time on watch forums I have never heard of a GS Diver failing. I doubt you ever will.

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