What time is it? Watches and horology

As that was loading I was guessing it was going to be a Royal Oak Offshore... yours beats it on WR though.

That calculator ain't waterproof

So I'm aware of the code, but don't manufacturers have to test and prove the rating? Therefore its definitely splashproof, but best you shouldn't try it if you can help it, but it should hold up if you do land in a pool.

Is the disalignment that the '30m' of water pressure measured statically with a uniform pressure increase in a tester is something that is possible (but unlikely) to occur dynamically while (e.g) swimming? (if, for example, wrist slaps into water?) Even if its a momentary increase in pressure.

Yeah I think it’s this. Localised/momentary pressure on a seal vs static even pressure.

I have manuals for 200m-rated Seiko divers that specify that you shouldn’t run the watch under a tap for exactly that reason.

I like to wear a watch swimming. You need a WR of 10 bar to do that really. Sinn have a decent vintage looking 10 bar chrono but it has day date complications that I don’t need.

The suggestion seems to be that doesn't matter, no idea if that is the case though

https://www.hodinkee.com/articles/what-dive-watch-depth-ratings-really-mean-and-whether-you-can-trust-them

https://www.watchuseek.com/threads/water-resistance-myth-vs-reality.239664/

Great reads. I've always swum in my dive watches - albeit the cheaper ones as if I'm swimming I tend to be doing other things where I wouldn't be wearing 'best' watches anyway - not quite there with #yachtlife yet.

50M and chrono (well stopwatch) .. you could probably find one with a calculator and kill three birds with one stone.

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Watches that actually say "Diver's" are a different thing to general WR rating. The ISO recommendations are the pertinent bits in that second link (tl;dr watches with a stated WR of 30 or 50m are not recommended for swimming):

The International Standard Organisation (ISO) have however created a recommendation table that is often found in watch manuals and brochures:
Water resistance rating Suitability:

Water Resistant 30 m or 50 m Suitable for water related work and
fishing.NOT suitable for swimming or diving.

Water Resistant 100 m Suitable for recreational surfing, swimming,
snorkeling, sailing and water sports. NOT suitable for diving.

Water Resistant 200 m Suitable for professional marine activity and
serious surface water sports. NOT suitable for diving.

Diver's 100 m Minimum ISO standard (ISO 6425) for scuba diving at
depths NOT requiring helium gas. Diver's 100 m and 150 m watches are
generally old(er) watches.

Diver's 200 m or 300 m Suitable for scuba diving at depths NOT
requiring helium gas. Typical ratings for contemporary diver's
watches.

Diver's 300+ m helium safe Suitable for saturation diving (helium
enriched environment). Watches designed for helium mixed-gas diving
will have additional markings to point this out.

The full metal G-shocks are 200m! Screw down caseback.

The new G-Lides are quite cool, I like the look of the display.

Arnie-lite on a too big fake Erica. 'Get to ze choppa' etc.

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This Omega should be ok for swimming and maybe a little diving. Good for 10928 metres. Get the Speedos on!

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Another gshock I like... Meh

I really like that 1963 Seagull 21 zuan job posted a few pages back.

Do they only come with clear backs?

On the subject of G-Shocks, have a black Casioak w/ white batons in the post and a "2nd gen" Royal Oak all metal conversion kit en route from the Orient.

I'd be interested to see how it turns out. I ordered one a few days ago from the link that Soul put up and I'm pondering doing the same metal conversion.

Massive unit. At least it doesn’t have the stupid omega valve

When you order straight from the manufacturer, you can choose the caseback option.

I can see my Seiko says Diver's but the Hydronaut doesn't. I wonder if that is a Diver's and they just didn't want to put it on the dial or they don't certify them.

I wouldn't swim with anything rated less than 100m. My Christopher Ward says 150m but doesn't have a screw down crown. I don't know how they manage that but I wouldn't worry swimming with it. I would not swim with the Chrono, as well as the 30m WR it has a leather strap at the moment too, so not good for wet environment anyway :-)

Looks great, is the screen that dim inside?

Nah, that's the sun I think

If it doesn’t say anything on the case back then it may be that they didn’t go through the certification process, but I’m sure it’s a legit diver. It might be noted in the manual/literature that would have come with the watch originally instead. I don’t think there’s any requirement that the designation appears on the watch itself.

There are a few other things required to meet the spec for designation as a diver’s watch, but assuming the bezel is unidirectional and the crown screws down I cant see anything that suggests it wouldn’t meet that.

So after trying to steal that French navy issued combat divers Tag Heuer I posted last week ( I failed ) it lead to a conversation with owner ( French chef I have known for years ) who was gifted it by his brother .
His brother was aforementioned combat diver with the MN . When I said the Tag was unusual as an issued watch normally they were Tudor Submariner.
He then said “ oh he has one of those as well”
This has sat in a box in France for 30 years , he is not sure if he wants to part with it . I am sure it’s gonna be about numbers.

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