Pedantic question: how does the second crown maintain WR when it doesn't screw down?

I've had the SPB121 for over a month now, and it's a wonderful watch, but I'm rather a stickler for watch hygiene. I want to give this a good cleaning after watching @PeterKotsa's video on the topic, but I would like to understand how the design implementation of only having one crown screw down out of two maintains water resistance.

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Screw down crowns are a safety feature to prevent inadvertent opening while diving etc.

Gaskets provide the water resistance.

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foghorn

Screw down crowns are a safety feature to prevent inadvertent opening while diving etc.

Gaskets provide the water resistance.

I think I understand this now. So the fact that the second crown can't be pulled out for any function means that it's safe with only the gasket in place?

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dpfotographic

I think I understand this now. So the fact that the second crown can't be pulled out for any function means that it's safe with only the gasket in place?

yup

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foghorn

yup

Thanks @foghorn. Case closed!

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As @foghorn said.

Here's my manual wind, non screw down diver from HVD.

And another example, Elliot Brown's Beachmaster NIVO, the 2 o'clock crown adjusts the internal bezel, no screw down.

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solidyetti

As @foghorn said.

Here's my manual wind, non screw down diver from HVD.

And another example, Elliot Brown's Beachmaster NIVO, the 2 o'clock crown adjusts the internal bezel, no screw down.

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Really liking the vibes coming off that HVD! 😍

I guess it's also alright to give my other non-screw down crown watches that have good WR a wash too as long as I am ultra careful when cleaning around the crown?

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dpfotographic

Really liking the vibes coming off that HVD! 😍

I guess it's also alright to give my other non-screw down crown watches that have good WR a wash too as long as I am ultra careful when cleaning around the crown?

Or a wipe down. I wouldn't use soap, not for fear of ingress, but the build up over time could gunk up the bezel.

But most, if not all, of my watches have been in/around water.

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That confused me as well. Was wondering if the second crown also screwed down, I guess not.

My Alpy version is also 200m, but with a single screw crown it made sense to me.

They are such versatile watches! being a smaller lighter and good looking daily wear …but having that huge reassuring 200m WR safety!

At work

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At sea 🌊

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Fieldwalker

That confused me as well. Was wondering if the second crown also screwed down, I guess not.

My Alpy version is also 200m, but with a single screw crown it made sense to me.

They are such versatile watches! being a smaller lighter and good looking daily wear …but having that huge reassuring 200m WR safety!

At work

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At sea 🌊

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The dial on the Alpinist Ginza blows my mind - just amazing. Thanks for sharing!

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I wish someone would screw down my crown…so I don’t overthink myself into anxiety.

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Slap our curved rubber straps on them and go shower with it!

https://sartorialestraps.com/pages/straps-for-seiko-alpinist

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foghorn

Screw down crowns are a safety feature to prevent inadvertent opening while diving etc.

Gaskets provide the water resistance.

Why this in mind, hypothetically, would winding/turning the crown underwater would cause harm to the watch?

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fadhil

Why this in mind, hypothetically, would winding/turning the crown underwater would cause harm to the watch?

Who said winding or turning? I said opening-as in pulling out.

But then again-who decides to wind a watch while underwater?

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foghorn

Who said winding or turning? I said opening-as in pulling out.

But then again-who decides to wind a watch while underwater?

Hahaha, I was adding on top of your comment mate. I was just wondering if turning (in a more realistic scenario, accidentally) the crown while being underwater would compromise the water resistance

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foghorn

Who said winding or turning? I said opening-as in pulling out.

But then again-who decides to wind a watch while underwater?

Someone trying to mischief his wife on the next watch purchase.