Alsta Nautoscaph IV Black Watch

The Alsta Nautoscaph IV Black Watch brings the unmistakable character of a classic 1970s diving watch into the modern era. Limited to just 240 pieces worldwide, this distinctive Alsta automatic watch combines a deep matte black dial, 40mm stainless steel case and vintage-inspired Milanese bracelet with the reliability of a Seiko NH35A automatic movement. Designed for collectors who appreciate authentic watchmaking heritage, the Nautoscaph IV Black offers timeless styling, practical diving functionality and impressive 300 metre water resistance.

The midnight black dial provides a refined backdrop for the Nautoscaph IV's bold hour markers and distinctive tapered sword hands. Applied indices feature C3 Super-LumiNova for excellent visibility in darker conditions, while a contrasting orange seconds hand adds a subtle touch of colour to the otherwise monochromatic design. The combination of prominent Arabic numerals, carefully proportioned markers and a practical date display gives this Alsta dive watch the instantly recognisable appearance of a vintage professional diving instrument.

Crafted from 316L marine-grade stainless steel, the 40mm case features brushed surfaces with polished edges, measuring 51.3mm lug-to-lug and 16.2mm thick. A unidirectional rotating timing bezel, scratch-resistant sapphire crystal and screw-down crown with cross-hatch engraving provide the durability expected from a professional diving watch. The engraved stainless steel caseback and 300 metre water resistance complete the robust construction, while the stainless steel Milanese bracelet adds a distinctive vintage-inspired finishing touch.

Inside the Alsta Nautoscaph IV Black is the dependable Seiko NH35A automatic movement, featuring 24 jewels, a frequency of 21,600 vibrations per hour and approximately 41 hours of power reserve. Functions include central hours, minutes, seconds and a date display. The movement is shock resistant and designed to meet ISO 764 anti-magnetic standards, offering reliable everyday mechanical performance without the need for a battery.

The Alsta Nautoscaph IV Black Watch is ideal for enthusiasts searching for an Alsta watch, Alsta Nautoscaph, black dial dive watch, vintage-inspired automatic watch or 300m diving watch. Limited to only 240 pieces, this distinctive timepiece combines the authentic design language of Alsta's historic diving watches with contemporary materials and dependable automatic engineering. With its matte black dial, Milanese bracelet and professional diving specifications, the Nautoscaph IV Black is a compelling expression of Alsta's modern heritage philosophy.

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
Shop with confidence with our 30-day returns policy on most items.

- 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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