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Citizen Tsuno Chrono AN3660-81A Watch
The Citizen Tsuno Chrono AN3660-81A is one of the most recognisable pieces in Record Label, Citizen's archive line that recovers its historical designs. Its reference is the 1973 Challenge Timer, the chronograph that popularised the bullhead format: pushers and crown on the upper part of the case. This version brings that silhouette back to the present with a panda-style dial and a steel bracelet with standard spring bar mounting.
The case is stainless steel, 38 mm in diameter and 11.7 mm thick, with a weight of 97-98 g. The crystal is spherical mineral and water resistance is 5 ATM (50 m). The movement is quartz, 0510 caliber, with an accuracy of ±20 seconds per month and a battery life of approximately 2 years. The bracelet is stainless steel and is mounted with standard 18 mm spring bars, not integrated: it can be replaced with a leather strap or another material of the same width. The clasp is a sliding clip with safety catch: the bracelet slides underneath to adjust the length and is secured with a safety clip, with no need to remove links.
The dial is white, with black sub-dials and orange hands. That combination is what gives it the "panda" nickname: the light background with dark counters and colour touches on the hands. The pushers on the upper part are not an aesthetic detail: they require a different gesture when operating the chronograph, with the thumb instead of the index finger.
The bullhead design is not handled like a conventional chronograph: the thumb operates the upper pushers without releasing the wrist, and the panda dial allows the chronograph to be read at a glance thanks to the contrast between the light background and the dark sub-dials. The 38 mm case and the steel bracelet keep the whole compact, without the bulk of a diving chronograph. It is an archive piece, but meant to be worn, and the standard spring bar mounting makes it easy to change the bracelet for a strap if a different look is sought.
Quartz 0510 Caliber 38 mm 5 ATM Mineral Crystal Bullhead Panda Dial Standard 18 mm Spring Bar
Why choose this watch?
Panda dial: contrast to read the chronograph
The white background with black sub-dials and orange hands is not only aesthetic: it creates the contrast needed to read the chronograph hands at a glance. It is the configuration that popularised the "panda" nickname in sports watchmaking, and Citizen uses it officially to describe this dial.
Bullhead design: pushers on top, chronograph at the thumb
The layout of the pushers on the upper part of the case is the hallmark of the Tsuno Chrono. It is not a conventional chronograph: the thumb operates the chronograph without releasing the wrist, a gesture inherited from the dashboard chronographs of the 1970s.
Steel bracelet with standard 18 mm spring bars
The bracelet is mounted with 18 mm spring bars, not integrated. That allows it to be replaced with a leather strap or another material of the same width without special adapters. It is an archive piece, but with the versatility of a conventional mounting.
Frequently asked questions
What does "panda" mean on this dial?
It is the nickname given to the combination of a light background with dark sub-dials. In this case, the dial is white, the chronograph counters are black and the hands have orange details. That contrast is what makes the chronograph easier to read and what gives the style its name. Citizen uses the term officially to describe this version.
Can the bracelet be replaced with a leather strap?
Yes. The bracelet is mounted with standard 18 mm spring bars, not integrated. An 18 mm leather strap will fit without adapters. The original bracelet can be stored and refitted when the steel look is wanted again.
Is it a diving watch?
No. It has 5 ATM (50 m) water resistance, which covers splashes, rain and hand washing, but it is not certified for diving. It is an archive chronograph, not an instrumental dive watch.
