Alsta Nautoscaph IV Tropic Watch

The Alsta Nautoscaph IV Tropic Watch makes an unforgettable impression with its vivid Tropic Orange dial, classic stainless steel diving watch design and impressive mechanical performance. Limited to just 50 pieces worldwide, this exceptionally rare Alsta automatic watch combines a 40mm stainless steel case, Seiko NH35A movement, traditional Milanese bracelet and 300 metre water resistance. Inspired by the bold colours of vintage professional diving instruments, the Nautoscaph IV Tropic offers a distinctive combination of retro character and modern reliability.

The vibrant orange dial is the defining feature of the Alsta Nautoscaph IV Tropic. Its warm, highly visible colour creates a striking contrast against the darker rotating bezel, while prominent Arabic numerals and applied hour markers ensure a clear, purposeful layout. Tapered sword hands and C3 Super-LumiNova provide excellent readability in low-light conditions, reflecting the practical origins of traditional diving watches. A date display adds useful functionality, while the carefully balanced dial design maintains the unmistakable character of the Nautoscaph collection.

The 40mm stainless steel case is constructed from 316L marine-grade steel, combining brushed surfaces with polished edges for a refined yet robust finish. Measuring 51.3mm lug-to-lug and 16.2mm thick, the case retains the substantial proportions associated with classic professional dive watches. A unidirectional rotating bezel, scratch-resistant sapphire crystal and screw-down crown support the watch's impressive 300 metre water resistance. Completing the design is a stainless steel Milanese bracelet, bringing a traditional vintage-inspired aesthetic to this vibrant contemporary edition.

Powering the Nautoscaph IV Tropic is the proven Seiko NH35A automatic movement, featuring 24 jewels, 21,600 vibrations per hour and a power reserve of approximately 41 hours. The mechanical calibre provides central hours, minutes, seconds and a date display, together with shock-resistant construction and ISO 764 anti-magnetic protection. Its reliable automatic operation makes the Tropic a practical everyday watch despite its highly exclusive production run.

The Alsta Nautoscaph IV Tropic Watch is a remarkable choice for collectors searching for an Alsta watch, Alsta Nautoscaph IV, orange dial dive watch, vintage-inspired automatic dive watch or rare limited edition watch. With only 50 pieces produced worldwide, the Nautoscaph IV Tropic is among the most exclusive watches in the collection. Its distinctive Tropic Orange dial, 40mm steel case, 300 metre water resistance and reliable automatic movement create a highly individual timepiece for enthusiasts who appreciate bold design and authentic diving heritage.

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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