Watchmaking in Japan

Iconic japanese calibres

July 2024

Iconic japanese calibres

Our thanks to Hirota Masayuki (Chronos Japan) for this selection.

Seikosha (Seiko) “Nardin-Type” (1930)

Part of Japanese manufacturers’ efforts to move upscale. This movement was modelled after Ulysse Nardin and Longines calibres, but lacked the quality of Swiss high-end products and was not a commercial success.

Seiko 6139 (1969)

The world’s first automatic chronograph movement, launched in early 1969. Its concise, magic-lever automatic winding and modern vertical clutch greatly influenced later automatic chronograph movements. In addition to the simple construction, flat levers made with a unique stamping process reduced production costs.

Miyota 2035 (1981)

The industry standard for all analogue quartz movements, with over 5 billion units produced until the 2010s. Despite being an inexpensive movement, it can be completely disassembled.

Citizen 0100 (2018)

Ultra-high precision analogue quartz movement with ±1 second accuracy per year. The tuning fork crystal of conventional quartz movements is replaced by an AT cut crystal for a very high frequency of 8,388,608 Hz. It is also photovoltaic, requiring no batteries.

Grand Seiko 9ST1 (2022)

Grand Seiko’s newly developed tourbillon with coaxial constant force. The sound of the constant-force mechanism is synchronised with the ticking of the escapement to create a pleasing musical quality.

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