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Blancpain identifies sunburst finishing, solid-gold applied hour markers and hand-filled Super-LumiNova hands as defining details of the Fifty Fathoms dial. The exact color and surface treatment depend on the reference: examples range from black and blue sunburst dials to meteor grey and a ceramic dial with a sunburst center and matte chapter ring.
What Blancpain says defines the dial
Blancpain describes sunburst finishes as treatments that “capture and transform light,” and says each dial requires meticulous craftsmanship. The brand also says the applied hour markers are crafted in solid gold and that the hands are filled with Super-LumiNova by hand. These are manufacturer descriptions, not independently verified construction details or legibility test results. Blancpain’s craftsmanship page
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The public description does not explain how the sunburst finish is produced. It does not establish the brushing apparatus or direction, number of finishing passes, coating formulation, dial substrate or production tolerances. The term identifies the stated visual finish, not a fully documented manufacturing process.
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Fifty Fathoms dials are not all finished or colored alike. Blancpain’s descriptions of these specific examples show how the treatment changes across the collection.
| Reference or variant | Manufacturer-described dial | What distinguishes it |
|---|---|---|
| Fifty Fathoms Automatique 5007 1130 B52B | Sunburst black | A dark, neutral sunburst finish. Blancpain model page |
| Bathyscaphe 5100 1140 O52A | Sunburst blue | Blue dial with sunburst finishing. Blancpain model page |
| Bathyscaphe 5100B 1110 B52A | Sunburst meteor grey | A grey, meteor-described appearance on a 38 mm variant. Blancpain model page |
| Bathyscaphe 5015-3603C | Ceramic dial with a sunburst center and matte chapter ring | Contrasts the center’s sunburst treatment with the chapter ring’s matte surface. Blancpain release |
| 38 mm collection variants announced in June 2025 | Sunburst finishes; examples include mother-of-pearl dégradé dials | Shows that the collection also includes color and material treatments beyond the named single-color sunburst examples. Blancpain announcement |
What the luminous details do—and what is established
Blancpain links the gold applied markers and hand-filled Super-LumiNova to visibility in different lighting conditions. The public wording describes the intended function; it is not an independent measurement of brightness, duration or legibility. The cited model descriptions do not establish that every reference uses identical marker or hand details, so those features should not be assumed for a particular variant without checking its specification.
Quick Recap
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- Blancpain Fifty Fathoms Bathyscaphe Automatic Blue Dial Men's Watch 5100-1140-O52A
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How to read a Fifty Fathoms dial description
- Check the exact reference. The finish and color can differ between Fifty Fathoms Automatique and Bathyscaphe variants.
- Separate color from surface treatment. “Blue” or “meteor grey” describes the appearance; “sunburst,” “matte” and “dégradé” identify distinct surface or color treatments when Blancpain specifies them.
- Look for contrasts within the dial. The 5015-3603C description, for example, distinguishes the sunburst center from its matte chapter ring.
- Treat construction and performance claims carefully. Blancpain’s published statements support its descriptions of materials and hand-applied luminous filling, but the cited material does not provide a process breakdown or independent visibility tests.
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