There are certain watches that feel entirely out of character for the brands that made them, and I genuinely think that the Patek Philippe 3629 ‘Bat’ is one of them. At first glance, it hardly reads as a Patek. Instead, it feels closer to a piece of high jewellery than a conventional wristwatch, defined by its sculptural form and stark, uninterrupted dial. Spend a bit more time with it, though, and that visual tension begins to make sense. For context, this was a period in Patek Philippe’s history where it moved beyond its usual design blueprint to explore something far more experimental.
The 3629 was one of the brand’s few horological products of that shift. As the quartz crisis reshaped the industry in the 1970s, Patek leaned heavily into design and experimentation, carving out a clear point of distinction. This meant integrated bracelets, unconventional case shapes, and the use of ornate hardstone dials. As you can see with the 3629, the case takes on a more expressive and avant-garde style while the dial is reduced to its bare essentials.
In case you haven’t caught on, the ‘Bat’ nickname comes from the 3629’s wing-like case silhouette. Crafted by Atelier Réunis as defined by the ’28 Key’ Poinçon de Maître hallmark on the inner caseback, this watch features an angular 37mm X 31mm double stepped case. Wearing thin and flat on the wrist, the 3629 is entirely sculptural in its purpose.
Fitted with a deep black onyx dial, the surface is completely uniform and blank, interrupted only by a pair of matching white gold dauphine hands and the Patek Philippe name. With nothing to distract from, the onyx takes centre stage, creating a broad expanse of negative space that highlights the beauty of the stone. Carefully cut from a single piece of onyx by Stern Frères, Patek’s long-time dial maker, it feels visually aligned with the case it sits within.
Powering the 3629 from within is the manual-winding Patek Philippe Cal. 177, a movement derived from the legendary ultra-thin F.Piguet 21. As you can see from the photos provided, the Cal. 177 is not just slim in stature, it is also traditionally finished with prominent Côtes de Genève (Geneva Stripes) and bears the prestigious Poinçon de Genève (Geneva Seal). As for its power reserve, it can hold a charge of up to 40 hours on a full wind.
Taken as a whole, the 3629 ‘Bat’ occupies an unusual corner of Patek’s catalogue of offerings. Produced from 1976 to approximately 1980 in both yellow and white gold, it was made in exceedingly low numbers. Only a handful of examples have appeared on the market, with this particular example in white gold being the rarest. Less than five white gold 3629's fitted with an Onyx dial and leather strap have appeared on the market.
With today’s collecting landscape appreciating design driven watches more and more, the 3629 stands front and centre. Combining a distinctive design, rarity and high-end watchmaking, the ‘Bat’ has all the hallmarks of being an important, collectable timepiece.
