Blancpain
Fifty Fathoms Automatique, Red Gold
Ref. 5015 3603C 63B
2019–present · 45mm · caliber Blancpain Cal. 1315: in-house automatic, 4Hz, 120h PR, 35j; 227 components, three series-coupled barrels, silicon balance spring
Live pricing is coming soon. Get notified when it is available for this reference.
Movement tier: unclassified
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.
Not yet rated
Community + OSINT signals haven’t landed for this reference yet. We don’t publish a rating against zero signal: the number would mean nothing. Editorial body + caliber + market value still surface above; ratings appear once the signal corpus does.
Search pre-owned listings
Authentication
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.
You might also like
Buying guidance
This watch on Blancpain’s site →
Sources for this entry: blancpain.com · blancpain.com
Pre-purchase sheet → The numbers to check, what to look at and what to ask, on one printable page.