Horological Meandering: Ultra-Thin Watch Size Correction

Marc Obermann · 2026-02-21T12:20:49Z

Marc Obermann corrects ultra-thin watch measurements for his Boucheron La Carree and Breguet Classique 3150BA/11/286, providing accurate specs.

Marc Obermann

WPS member · Horological Meandering forum

15 replies481 views5 photos

Marc Obermann's commitment to accuracy in horological discussion sets a high standard for the WatchProSite community. This article revisits his initial measurements of two significant ultra-thin timepieces, the Boucheron La Carrée Ultra Plate and the Breguet Classique Ultra Thin, providing corrected data and reaffirming their status as exceptional examples of slender watchmaking. Obermann's dedication to precision, even when correcting his own work, underscores the value of meticulous detail in watch collecting.

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Hi all so recently whilst posting about my newest arrival a Breguet Classique Ultra Thin and the way I was measuring its thickness something amanico said struck a chord with me that possibly my attempts at accurately measuring how thin this watch and my Boucheron La Caree Ultra Plate were being measured really wasn't that accurate. I admit my eyesight is no longer 20/20 and using a tape measure maybe wasn't such a good idea after all to get an accurate reading. So I sought and bought a jewellers electronic digital caliper and now I have accurate measurements and whilst not as good as I initially thought they are still well within the size to be considered as Ultra Thin watches. Below are the results and some pictures. and finally apologies for posting incorrect information I will try to avoid making such a stupid mistake in my excitement again.

Boucheron La Carre Ultra Thin 25mm x 25mm 3.3mm thin.

Boucheron La Carree Ultra Thin 3.3mm

Boucheron La Caree Ultra Thin wrist shot

Breguet Classique 3150BA/11/286 Ultra Thin 33mm 4.3mm thin

Breguet Classique Ultra Thin 4.3mm

Breguet Classique Ultra Thin

Finally a shot of both of them.

Boucheron La Carree Ultra Thin/ Breguet Classique Ultra Thin.

Once again my apologies to all on the forum for misleading you and I will try better not to make such a silly mistake again.

Marc

About the Cartier Tank Must Ref. WSTA0041

The Tank Must represents Cartier's return to accessible luxury within their iconic Tank lineage, reviving the spirit of the original Must de Cartier collection from the 1970s. This contemporary interpretation maintains the essential DNA of Louis Cartier's 1917 design while addressing modern market demands for entry-level luxury timepieces. The collection bridges Cartier's haute horlogerie heritage with contemporary accessibility, positioning itself as the gateway into the Tank universe.

This caseback view reveals the clean, geometric proportions that define Tank architecture. The rose gold case construction demonstrates Cartier's commitment to premium materials even within their more accessible offerings. The integrated crown design and refined case finishing showcase the technical execution that separates Cartier from fashion watch competitors, despite the quartz movement's utilitarian nature.

The Tank Must has generated significant collector interest as both an entry point for new Cartier enthusiasts and a daily wearer for seasoned collectors. Market reception has been strong, with the collection successfully capturing younger demographics while maintaining brand prestige. The rose gold variants command premium positioning within the Must range, offering precious metal luxury at a fraction of traditional Tank Louis Cartier pricing.

Specifications

Case: rose gold

Diameter: 33.7mm

Dial: unknown

Key Points from the Discussion

The community acknowledges that Marc's initial measurement error was driven by passion and enthusiasm, not an intent to deceive, and that such minor discrepancies do not diminish the inherent elegance and appeal of the watches.
Marc's post introduced the Boucheron La Carrée to a wider audience, highlighting its unique design and clasp system, which was previously less known compared to other watches with distinctive clasps like the Piaget Upstream.
Despite the slight adjustment in measurements, the watches remain highly appealing and are considered a superb pair within the ultra-thin category.

The Discussion

Uncle Chico

Feb 21, 2026

Stupid mistakes made in the rush of excitement are my speciality. ;-)))

Love the Breguet.

Marc Obermann

Feb 21, 2026

Thanks for your kind words and I love them both for different reasons besides being Ultra Thin.

Marc

quattro

Feb 21, 2026

I don't remember the numbers you had in mind previously,

but these are definitely ultra-thin and ultra-elegant watches, Marc! We know perfectly well that you didn't want to deceive anyone, of course, and passion and enthusiasm are an integral part of our hobby! Best regards, Emmanuel

Marc Obermann

Feb 21, 2026

Thanks for your kind words I appreciate them, differing opinions are fine facts not so much:))

Marc

S F

Feb 21, 2026

No worries, we don't have to take this too seriously, just a hobby😁

Marc Obermann

Feb 21, 2026

I agree but incorrect information really bugs me.

Marc