Alsta Nautoscaph IV Blue Shark Watch

The Alsta Nautoscaph IV Blue Shark Watch captures the spirit of ocean exploration through a vibrant blue dial, classic diving watch architecture and dependable automatic engineering. Produced in a limited edition of only 100 pieces, this distinctive Alsta dive watch features a 40mm stainless steel case, Seiko NH35A automatic movement, stainless steel Milanese bracelet and 300 metre water resistance. With its rich blue colourway and authentic vintage-inspired design, the Nautoscaph IV Blue Shark is a standout addition to the Alsta collection.

The striking blue dial gives the Nautoscaph IV Blue Shark its unmistakable identity. Inspired by the changing colours of the ocean, the dial provides a vivid backdrop for bold Arabic numerals, applied hour markers and tapered sword hands. C3 Super-LumiNova ensures excellent readability when light levels fall, while the matching blue timing bezel creates a coordinated appearance. A discreet date display adds everyday practicality without detracting from the clean, functional layout of this classic automatic diving watch.

The robust 40mm case is crafted from 316L marine-grade stainless steel, featuring a combination of brushed surfaces and polished edges. With a 51.3mm lug-to-lug measurement and 16.2mm case thickness, the Nautoscaph IV offers a confident presence on the wrist. A scratch-resistant sapphire crystal protects the dial, while the unidirectional rotating bezel and screw-down crown provide essential diving functionality. The watch is water resistant to 300 metres and is completed by a traditional stainless steel Milanese bracelet that reinforces its vintage character.

At the heart of the Alsta Nautoscaph IV Blue Shark is the Seiko NH35A automatic movement. Featuring 24 jewels and operating at 21,600 vibrations per hour, this mechanical calibre provides approximately 41 hours of power reserve. Central hours, minutes and seconds are accompanied by a date display, while shock-resistant construction and ISO 764 anti-magnetic protection support reliable performance. The movement combines established mechanical engineering with the practical simplicity expected from a purpose-built dive watch.

The Alsta Nautoscaph IV Blue Shark Watch is an excellent choice for anyone searching for an Alsta watch, Alsta Nautoscaph, blue dial dive watch, blue automatic watch, limited edition dive watch or vintage-style diving watch. Limited to just 100 pieces worldwide, the Blue Shark combines a vibrant ocean-inspired dial, 40mm stainless steel construction, 300 metre water resistance and dependable automatic movement. It is a distinctive expression of Alsta's commitment to preserving the character of classic watches while refining them for modern collectors.

Extended Christmas Returns

In addition to our 30 day returns policy, all items purchased from 1st October 2026 can now be returned until 8th January 2027. Standard terms below apply.

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30 Day Returns
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- Return or exchange within 30 days of delivery
- Items must be unworn and in original condition
- Includes all packaging, documentation and accessories
- Sale, pre-owned or promotional items may be subject to a 14-day return period

Important Information

- Bespoke, personalised or resized items are non-returnable
- Altered watch bracelets are considered customised
- Returns should be sent via insured, tracked delivery

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