Fifty Fathoms Automatique

The Fifty Fathoms Automatique is the full-size expression of Blancpain's dive lineage, running the in-house caliber 1315 with a 120-hour power reserve in a 45mm steel case rated to 300 meters. It traces a direct line back to the 1953 original, which predates the Submariner and set the template for the modern dive watch. For a collector who wants depth and historical legitimacy in the same piece, there is no stronger argument in the category.

What it is

Blancpain introduced the Fifty Fathoms in 1953 in collaboration with French navy diver Robert Maloubier, making it the first watch purpose-built to modern dive watch specifications. It established conventions the entire category later adopted: rotating bezel, luminous dial, screw-down crown, water resistance measured in fathoms. The reference went dormant during the quartz era along with most of Blancpain's catalog, and was revived in the early 2000s as the brand rebuilt under the Swatch Group.

The modern 5015 Automatique arrived in 2007 as the flagship of that revival, offering the historical connection to 1953 with a fully contemporary movement architecture. Caliber 1315 was developed specifically for the Fifty Fathoms line and remains one of the more technically serious in-house dive movements available.

Buying notes

At 45mm, this is a large watch and will wear large on smaller wrists. Blancpain made no attempt to slim it down for modern taste, so try it on before committing. The 5015 reference spans nearly two decades and includes multiple dial and strap variations; confirm exactly which configuration you are buying, since some combinations are harder to resell than others.

Earlier examples from 2007 to 2012 have had isolated reports of lume degradation on the chapter ring, worth inspecting under a loupe. The sapphire exhibition caseback on the 5015 is a nice feature but makes the case slightly more vulnerable to impact from behind than a solid caseback. Gray market pricing on this reference is competitive, but verify the full documentation set as it affects both serviceability and resale.

Market read

The 5015 Automatique trades in the $10,000 to $14,000 range on the secondary market depending on condition, dial variant, and whether the original bracelet or strap is included. It holds value steadily rather than appreciating sharply, which means it is reasonably priced for what it delivers mechanically. New examples list around $17,000 to $18,000 at authorized dealers, so the gray market discount is meaningful.

Demand is consistent among serious collectors and tends not to spike or crater with fashion cycles.

Service expectations

Caliber 1315 is a robust movement with a five-day power reserve and a silicon balance spring, and Blancpain recommends service intervals of around five years for a watch used regularly in water. Service is best handled by Blancpain directly or by an independent with documented experience on the 1315, as the silicon hairspring requires specific tools and handling protocols different from conventional hairsprings. Budget roughly $800 to $1,200 for a full service including pressure testing, which is non-negotiable for a dive watch intended to be used as one.