Illustration. The seconds hand sweeps, like the real movement.
Why it's interesting
Named after the barnacles covering a 1977 Challenge Diver that was found, still running, on an Australian beach, the Fujitsubo pairs that watch's chunky 1970s shapes with a hardened titanium case and a 4 Hz in-house movement. At 108 g on its bracelet, it's a dive watch you forget you're wearing.
Watch DNA. Filled tags are editorial; outlined tags come from the specifications.
The numbers
Verified specificationsSize
- Diameter
- 41mm
- Lug to lug
- —
- Thickness
- 12.3mm
- Lug width
- 20mm
Also in the Promaster Mechanical Diver family
Because you like this…
Chosen for shape, size, colour, character and price. Rarely the same brand twice.
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About this page
Verified specifications, checked September 2026
Dimensions, water resistance, movement and crystal were checked against the sources below.
41 mm, 12.3 mm, 20 bar, 108 g, 20 mm lugs, sapphire and calibre 9051 from Citizen Europe (€749). Barnacle backstory from Citizen US. Lug-to-lug isn't published by Citizen and reviewers' measurements disagree, so it's blank. Year: Monochrome reviewed it in September 2022 as Citizen's latest diver. The black NB6021-17E on a polyurethane strap is the other regular version; it's sold out at Citizen US and no longer listed by Citizen Europe, so the blue bracelet model was chosen.
The illustration is a bezelga rendering generated from the specifications. It is not a photograph and may simplify details such as logos, text and finishing.
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