Jowissa
Seamon 300
A Swiss dive watch rated to 300 metres with a sapphire crystal and BGW9 luminous markers, produced in a strictly limited run.
Details checked on 7th September 2026
The Seamon 300 is Jowissa's professional-grade diver, water resistant to 300 metres (1000ft) and fitted with a 3mm-thick sapphire crystal for scratch resistance. Its markers and hands use BGW9 lume for strong low-light legibility, and the model is issued as a numbered set strictly limited to either 111 or 333 pieces.
Unlike the brand's dress-oriented Facet and Roma lines, the Seamon 300 is built to tool-watch standards, with a case and crystal specified for real diving use rather than styling alone. The limited production run marks it out from Jowissa's wider catalogue of open-ended collections.
