|Winding:||Automatic, Bi-Directional Automatic Winding, Central Rotor Automatic Winding|
|Diameter:||25.60 mm (11.5 ligne)|
|Complications:||Big Date, Date, Day/Night Indicator, Double Wheel Big Date, GMT Hand, Independently-Adjustable 12 Hour Hand, Modular|
|Hands:||Big Date at 12:00, Central Hour Hand, Central Minute Hand, Central Seconds Hand, Day/Night Indicator Disc at 8:00, Hour Hand at 6:00, Minute Hand at 6:00|
|Distinguishing Technical Characteristics|
|Production: 2016 – Current|
Cal. C120 is an automatic movement with big date, independently-adjustable second timezone dial, and day/night indicator. It is produced by Soprod using a module on the Cal. M100 base and was formerly known as Cal. SOP 9351/A10-2. This module adds 1.5 mm to the thickness of the A10-2, bringing the total to 5.10 mm. Like the A10-2, it measures 25.60 mm (11.5 ligne) in diameter.
The big date complication uses dual discs with a pair of windows at 12:00 on the dial. The second timezone dial features both hour and minute hands and sits at 6:00 with the day/night indicator just above this at 8:00.
Soprod A10 Family History
Soprod announced their Swiss Made version, “Alternance 10” or “A-10”, in 2004 and began offering it to Swiss watch makers. The company was not explicit about the design source of the movement. In 2007, Soprod was acquired by Peace Mark of Hong Kong for the company’s quartz movement operations in China, and the Swiss mechanical operations were sold to Festina Group the following year. Seiko introduced their own 4L25-powered Brightz and Credor models, though the 4L family remained rare and was retired after 2013. Soprod continued to produce the A-10 as well as many modules in partnership with Dubois-Depràz.
Soprod redesigned the movement and announced the updated and renamed Cal. A10-2 in 2012. At this time the company also reworked and renamed the module series to differentiate their products from the simpler offerings of the competition. The A10-2 was renamed Soprod M100 in 2016, along with another refresh of the modular offerings.Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.