|Winding:||Automatic, Bi-Directional Automatic Winding, Central Rotor Automatic Winding|
|Diameter:||29.00 mm (13 ligne)|
|Complications:||24 Hour Hand, Date, Day, GMT Hand, Hacking Seconds, Independently-Adjustable 24 Hour Hand, Modular, Outer Day Wheel, Quick Date Correction|
|Hands:||Central 24 Hour Hand, Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00, Day Window at 12:00|
|Distinguishing Technical Characteristics|
Sprod Cal. C135 is a modular automatic movement with outer day and date windows. It combines a module, likely made by Dubois Depraz, with Soprod’s M100 base.
Soprod A10 Family History
SFT subsidiary, Indtec SA, 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. The company took the Soprod name shortly after, with the movement commonly called “A-10.” 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.