Cal. C125 is a modular automatic movement with a GMT function. Built on the Soprod A10-2 base (now known as M100), this movement differs from other GMT movements in that the “local” time (quick-set hours) is the 24 hour hand rather than the standard 12 hour hand. The date is similarly “tied” to the regular timekeeping hands, and pulls the GMT time along with it. This is due to the fact that the module uses the day mechanism rather than a unique gear train.
The GMT module increases the movement thickness from 3.6 mm to 4.1 mm and the stem height from 1.5 mm to 2.0 mm. Interestingly, Hager claims that this movement is 5.67 mm thick, uses Novodiac rather than Incabloc, and has 40 hours power reserve.
Formerly known as Calibre SOP 9384/A10-2, the movement was renamed Cal. C125 in 2016 when Soprod renamed the A10-2 to M100.
Cal. C125 is used by Oak & Oscar and Hager.
Soprod A10 Family History
Seiko Instruments first designed their Cal. 4L family to create an ETA 2892A2 competitor for the Swiss OEM market. It appears that it was not intended for use in Seiko products initially.
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.