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The Nautoscaph

A 1960s icon,
re-engineered for the deep.

The Nautoscaph draws its inspiration from Alsta’s own 1960s dive watches, reimagined to meet the rigorous demands of contemporary exploration. Its distinct skin diver case shape pays homage to the era when form followed function, resulting in a design that is as enduring as it is practical.

With 300-meter water resistance, a screw-down crown, and C3 Super-LumiNova ensuring visibility in the darkest depths, every detail is meticulously engineered for reliability. The unidirectional rotating bezel provides a precise tool for divers, while the watch’s case—in 316L stainless steel—balances durability with an elegance that evolves over time. The dial selection reflects a bold, adventurous spirit, with the striking tones of the Blue Shark.

ALSTA
NAUTOSCAPH IV

Blue Shark

01/ 08
Alsta Nautoscaph IV Blue Shark
Blue Shark dial detail
Blue Shark bezel and dial at an angle
Blue Shark side profile
Blue Shark bracelet clasp
Blue Shark caseback
Blue Shark lume

Complete Specifications

Case & dimensions

Case316L marine-grade brushed stainless steel with polished edges
Diameter40mm
Lug-to-lug51.3mm
Lug size20mm
Thickness16.2mm

Bezel & crown

BezelSteel, unidirectional, blue ceramic insert
CrownScrew-down, polished stainless steel
DetailCross-hatch engraving

Movement

CalibreSeiko NH35A automatic
Jewels24 jewels
Frequency21,600 vibrations/hour
Power reserve41 hours
Accuracy±30 seconds/day
ProtectionISO 764 anti-magnetic, shock resistant
FunctionsHours, minutes, seconds, date

Dial & hands

DialSunburst blue with applied C3 Super-LumiNova indices
HandsTapered sword hands with C3 Super-LumiNova

Crystal & caseback

CrystalScratch-resistant sapphire
CasebackStainless steel, engraved

Water resistance

300m999ft · 30 ATM

Alsta Nautoscaph Blue Shark skin diver watch worn on the wrist
—On the wrist
Made to endure

Built to last a lifetime of exploration

At Alsta, we draw on our heritage to build best-in-class skin diver watches: thin, mechanically precise and elegant by design.

  1. I

    Heritage, evolved

    The modern Nautoscaph speaks the design language of the original. Its proportions have grown and new looks have arrived, from coloured dials to a bronze case, but its elegance never left.

  2. II

    Built for adventure

    Ruggedness and water resistance sit at its heart. Elegant looks, built to shrug off the knocks of any good adventure.

Tough enough for the mountain face or the ocean. Elegant enough for the boardroom or the dinner table.

A skin diver at heart · Rated for professional dive depths · A permanent fixture in the Alsta line