The Bronze Field Guide

Blancpain Fifty Fathoms 70th Anniversary Act 3

5901 5630 NANA

The Blancpain Fifty Fathoms 70th Anniversary Act 3 is a current-production diver watch with a 9k bronze gold (approx 50% copper, 37.5% gold, plus silver, palladium and gallium), maker-stated case. It measures 41.3 mm across, and is water resistant to 300 m. Inside is the 1154.P2 automatic movement, with 100 hours power reserve. Complications: Time only. Brand origin: Switzerland.

Bronze diver watchesBronze goldSkin-safe backDiversDisplay back
Reference
5901 5630 NANA
Type
Diver
Price
Case diameter
41.3 mm
Thickness
Lug-to-lug
Water resistance
300 m
Weight
Origin
Switzerland
Movement
Automatic
Caliber
1154.P2
Power reserve
100 hours
Complications
Time only
Ceramic
Bronze (grade not stated)
Colour
Hardness
Construction
Assembled
Surface treatment
Caseback
Bronze gold
Nickel-free
Yes
Bracelet / strap
NATO/textile and additional straps
Ceramic bracelet
Crystal
Sapphire
Display back
Yes
Dial
Black, MIL-SPEC style with moisture indicator
Lume
Super-LumiNova
Availability
Offered
Status
Current (limited edition, 555 pieces)
High confidence Verified Jul 2026 Source: Blancpain / Monochrome Maker / listing ↗
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Frequently asked questions

Is the Blancpain Fifty Fathoms 70th Anniversary Act 3 nickel-free?

Yes. Nothing nickel-bearing touches the skin: a 9k bronze gold (approx 50% copper, 37.5% gold, plus silver, palladium and gallium), maker-stated case with a bronze gold caseback, plus a non-steel crown and strap. The Bronze Field Guide marks it nickel-free for whole-watch skin contact. If your allergy is severe, confirm the contact points with the maker.

What bronze alloy is the Blancpain Fifty Fathoms 70th Anniversary Act 3?

The Blancpain Fifty Fathoms 70th Anniversary Act 3 has a 9k bronze gold (approx 50% copper, 37.5% gold, plus silver, palladium and gallium), maker-stated case with a bronze gold caseback. This is confirmed against the maker spec.

What size is the Blancpain Fifty Fathoms 70th Anniversary Act 3?

It is 41.3 mm in diameter, and water resistant to 300 m.

How much does the Blancpain Fifty Fathoms 70th Anniversary Act 3 cost, and is it available?

It is current-production; the guide does not list a price for it.

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