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Movement tier: unclassified · caliber Blancpain Cal. 1315: in-house automatic, 4Hz, 120h PR, 35j; 227 components, three series-coupled barrels, silicon balance spring · 120h power reserve (5 days)
Large case: suits wrists 7 in+ (18 cm+)
45 mm case. 23 mm lug width. A bold, statement-size wear. Best suited to larger wrists where the case sits flush.
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A 45mm Fifty Fathoms in red gold with a ceramic dial. Blancpain is counterfeited at the Fifty Fathoms end, and the things that distinguish this reference from a cheaper one, the gold and the ceramic dial, are exactly the things a fake would imitate first.
Known issues in the market
The dial is blue CERAMIC with a sunburst centre and a matt chapter ring, not lacquer over brass. Ceramic reads deeper and cooler in the hand and does not craze.
Cal. 1315 runs three series-coupled barrels for a 120-hour reserve. A Fifty Fathoms that stops well short of five days from full wind needs service, and a movement that runs 40-odd hours is not this caliber.
45mm in solid gold is heavy. Unusual lightness for the size is worth a question.
Area
What to check
What is correct
Red flag
dial
Ceramic dial surface
Deep, even blue with a sunburst centre and a distinctly matt chapter ring; no orange-peel and no lacquer meniscus at the edges
A glossy painted look, or any crazing, which ceramic does not do
movement
Cal. 1315 power reserve
Runs to roughly 120 hours from full wind
A reserve near 40-50 hours, which points at a different movement entirely
case
Red gold hallmarks and weight
Hallmarked, and heavy for 45mm
Light for its size, or hallmarks that are shallow or uneven
case
Unidirectional rotation
Anticlockwise only, with a defined action
Bidirectional rotation, which no Fifty Fathoms dive bezel has
Common legitimate replacements
Straps are consumable on a Fifty Fathoms and are replaced routinely.
Bezel inserts are replaced after damage; confirm the part came from Blancpain.
Expert resources: Blancpain service can confirm the reference against case and movement numbers. The other Fifty Fathoms entries in this catalog cover the family's shared tells.
