Gut Reaction Reviews – First Look At The New Sinn U50 S Mother-of-pearl S

A practical tool diver with jewellery aesthetics: presenting the best of both worlds with the new Sinn U50 S Mother-of-pearl S

Editor’s note: Like you, we are also excited for the releases from the 2021. Before we get to dive deep into the releases and go hands-on with as many of these as the two of us here can, here’s our preview and the Gut Reaction Review (Grr…) of the new Sinn U50 S Mother-of-pearl S. For our other detailed hands-on reviews, please head to our dedicated reviews section here.

New Sinn U50 S Mother-of-pearl S

Gut Reaction

My first reaction on looking at the new Sinn U50 S Mother-of-pearl S divers was of pause-and-applause. I paused because, and I could be wrong, but one doesn’t usually associate ‘men’s’ dive watches with mother-of-pearls (even though both exist in the maritime universe). Perhaps Sinn wants men to come out of their comfort zones, or perhaps Sinn wants to capture the ladies market with this release. And I applauded because I think it’s pretty freakin’ cool for a diver to have a unique mother-of-pearl dial. It’s something I least expected from Sinn and for me, brands shine the most when they either break unspoken rules or release novelties that are, well, novel.

I reckon the new Sinn U50 S Mother-of-pearl S is for those who seek individuality over herd mentality, and for those who love the Sinn design language and want something peculiar in their watch box. I like it for its difference, and also aesthetically for the legibility aided by the clean dial that’s loud and bold yet understated at the same time. 

Uniquely numbered and boasting of a light-reflecting and shimmering black mother-of-pearl dial that creates an exciting interplay of colour, the new U50 S has got a great duality to it that worth admiring. 

The Watch 

The new Sinn U50 S Mother-of-pearl S ref. 1050.0201 is a limited-edition release of 500-pieces featuring the SW300-1 which is an automatic-winding movement. The movement is anti-magnetic as per DIN 8309 and features 25 jewels, beats at the frequency of 4Hz (28,000 vph) and is encased inside a 41.0mm diameter and 11.15mm thick German Submarine Steel case with Black Hard Coating on a TEGIMENT Technology basis with a band lug width of 20mm and a screwable crown at 4’o clock. 

Another standout feature is the rotating bezel; it makes use of the brand’s TEGIMENT Technology that not only hardens the bezel surface for heavy-duty wear but also makes it scratch-resistant. A true dive watch from the word go, it also comes with a DNV GL certification solidifying the brand’s claim of the watch being water-resistant to depths of 500m (50 ATM).

New Sinn U50 S Mother-of-pearl S


Until 2019, the U-series watches were available in two large sizes, 44 (U1, U2, and UX) and 47mm (U212). Fairly popular, there was a growing demand for a slimmer wrist-friendly version. In 2020, Sinn answered, and released the U50, U50.S, and the U50.SDR.

Following up on last year’s releases is the new Sinn U50 S Mother-of-pearl S diver. True fans of the brand would be happy to note that this new variant is offed in a more compact case size.



Sinn describes the reason behind choosing this dial: “Combining mother-of-pearl with a diving watch seems only natural, given that they are united by the element water. What’s more, mother-of-pearl is a naturally occurring product, making each dial unique”.

Wish List

Nah, nothing for a change; I like it the way it is. 


That’s All Folks! 

As the light would fall on the dial, it should change colour, revealing a sort of water-body inspired aesthetics, like ripples in a lake. What’s fascinating is that under dark lighting conditions, this mother-of-pearl will recede from the spotlight, and the time-telling devices will shine to get the job done. 

New Sinn U50 S Mother-of-pearl S

Trust Sinn to come up with a beautiful dialled watch that when it comes to putting it to test, makes sure it doesn’t take away the attention from the one thing that makes tool watches special, legibility. And the presence of German submarine steel that is very ductile, rust-free and non-magnetic ensures that the diver is up for any challenge you wish it to endure. 

In short, retailing for $4’675 AUD, the new Sinn U50 S Mother-of-pearl S may be different from what you would expect from Sinn, it still doesn’t lose its purpose as an instrument of time. 

It’s the marriage of style with substance. 


To find out more about the new Sinn 144 St S Anniversary II and other Sinn watches, please head to their website here. All images unless otherwise specified are © Sinn / Copyright Sinn Spezialuhren. Make sure to check out our reviews of other Watches & Wonders 2021 releases here.