To create a robust watch with water resistance up to 1300 meters, the design features a stable, solid square form. All unnecessary decorations have been eliminated, focusing solely on essential functions. The side surface is made as smooth as possible, and the bezel has large cutouts so it can be operated even while wearing gloves. The front features a rare shape for a non-standard model, with the quarter section from 12 to 3 o'clock (excluding the crown) rotated and copied at 90-degree intervals—this is a distinctive feature of this model. The four screws that secure the glass are also beautifully designed to prevent the glass from popping out when internal pressure rises as the watch surfaces from saturation diving. For visibility in the dark depths where light does not reach, each hand has a different shape, and the dial is designed to match the hands. This design embodies CITIZEN's idea of 'functional beauty,' born from the pursuit of functionality and the elimination of waste for use in harsh environments.
A bezel shape that is easy to turn even when wearing gloves. The crown is designed not to touch the wrist. A form born from function. A rounded yet powerful and reassuring form.
A case design without lugs, considering the fit on the wrist.
Large recessed and protruding shapes to protect the bezel at four points and to enhance the operability of the unidirectional locking mechanism.
The case back is recessed into the case, resulting in a design with minimal unevenness.
The solid square case, with the quarter section from 12 to 3 o'clock rotated and copied at 90-degree intervals, provides strength and reassurance.
A dial design that allows you to quickly recognize the 12 o'clock position and, in combination with the hands, ensures accurate time reading.
For visibility, all three hands are designed with different shapes.
ENGINEER'S EYE
World‑Leading Pressure Resistance (1982)
As a diver's watch of its time, it was highly distinctive, with four very unusual bezel guards, a large rotating bezel with pronounced recessed and protruding features, and a square case shape without lugs—altogether giving it a face that seemed to embody its pressure-resistance performance. It is one of CITIZEN’s representative watches.
To reduce contact with the wrist while diving, the crown was positioned at 9 o’clock, and the inclusion of a day-and-date display on a diver's watch was also extremely rare for the time.
Packed with professional-grade features, it boasted what could be called the crystallization of CITIZEN’s technology at the time: a cutting-edge titanium exterior, a register ring with a misoperation-prevention locking mechanism, high-strength glass with anti-fog treatment, enhanced anti-magnetic protection for the movement, blockage of helium gas penetration, and a band designed with special mesh sandwiched in synthetic rubber so that even if it breaks, the watch will not fall from the wrist.