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. Nothing touching the skin is nickel-bearing steel, verified across the case, caseback and bracelet.

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