All You Need to Know About Water Resistant Watches

You’re traveling to Greece to relax and spend a lot of time in the swimming pool. Of course, you need to bring a watch (or several) with you. The swimming pool is 3 meters deep so a watch that is water resistant up to 30 meters should be ok. Right?

While you’re on the beach in Ibiza, you see people having fun jet-skiing and you want to hop on a jet-ski as well. The watch you’re wearing has a water resistance of 100 meters and you’ll never get that deep on a jet-ski so it should be fine. Right?

Both wrong.

In this article, I’ll explain what the different water resistance ratings mean for your watch and what you can safely do with it.

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Omega Speedmaster 105.012 – The Real Moonwatch

The current Speedmaster Professional, the descendant of the ref. 145.022, produced with minor changes from 1968 until this day, is often called the “Moonwatch.”

That is rather interesting because the 145.022 wasn’t the watch first worn on the Moon. This title goes to the ref. 105.012.

What is it?

The ref. 105.012 was the first of the “Professional” models.

It features the asymmetric case with a crown and pusher guard, flowing seamlessly into the lugs- sort of a thicker right flank of the case.

It was powered by the same movement as all other “pre-Moons”- the cal. 321. Its introduction coincided with that of the ref. 105.003.

Both were in production since 1963. Therefore, it’s hard to speak of the 105.012 as a successor to the 105.003. It was just a slightly more modern, more avant-garde take on the very same thing.

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Service: Tissot Antimagnetique Jumbo Cal. 27

This is a nice early Jumbo Tissot Antimagnetique. The diameter is 38 mm without the crown.

Early Tissot watches, including the Antimagnetique, came with all kinds of evolutions of the Tissot 27, but this one has the base caliber.

The serial number is 1010496 and that dates this watch to 1938 or 1939.

This Tissot needed a service because it was a couple minutes fast, with the regulator in the middle position. It also needed a new crystal and a new crown.

Forgive me for the watch strap that is broken and too small.

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Watch Happening – Best of the Blogs – August 2017

This is the first ever WahaWatches round-up post.

A personal selection of the best watch related articles from around the web. I hope you’ll enjoy them.

Click on the picture or on the hyperlink to read the articles.


There are only two horological conservationists in the United States, and Brittany Cox is one of them.

She’s always busy, 7 days a week, and repairs might take anywhere from a few days to a couple years.

Read about a normal work day as an antiquarian horologist and the challenges that she faces in her work and in her efforts to get others involved in horology.

Source: Worn & Wound – Interview: Mechanical Magic with Antiquarian Horologist Brittany Cox

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Service: Certina Club 2000 With 25-66M Movement

This is a wonderful vintage Certina Club 2000.

Although it’s one of the lower grade Certinas, it’s still beautifully finished and it has a solid stainless steel case.

All the Certina in-house movements that I’ve encountered are great performers and you can accurately regulate them with the micro-regulator.

Sadly, the 25-66M movement in this Certina wasn’t running.

Certina produced the 25-66M from ’75 till ’77. This Certina has a serial number that consists of 9 digits and that indicates that it’s a ’74+ piece so it’s all adding up.

There were some problems with winding because you could wind it until forever without it ever building up any resistance. If you think that sounds like a broken mainspring, you’re right!

It also had some problems with water resistance because at one time the crystal fogged up during an exceptionally hot day.

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