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You are here: Home / Families / Soprod A10 Family

Soprod A10 Family

Last Update: July 7, 2019

BRANDS: Soprod

Production: 2004 – Current
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s
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The Soprod “Alternance 10” (also called the A-10, A10, and A10-2) is a Swiss Made movement based on the Seiko 4L25 design but produced in Switzerland under license. It is an advanced, slim automatic movement with modern technology and is not a clone of the ETA 2892A2 with which it competes.

The A10 is instantly recognizable thanks to its counter-clockwise balance cock and automatic winding rotor mounted with three screws and seven ball bearings. The overall design is identical to the Seiko 4L/6L family movements, though the finishing and some movement details are quite different.

Seiko Cal. 6L75
Soprod Cal. M100
The Soprod A10-2 is based on a Seiko design

Although a Japanese design, it includes many signature Swiss features, including Incabloc Double-Cone shock absorbers and an oscillating pinion automatic winding switcher. It is exactly the same size as the ETA 2892A2, with the same locations for dial feet, crown, hands, and date window. This makes it a drop-in replacement when that movement is unavailable.


Soprod A10 Family History

This early promotional photo shows the “Alternance 10” with Soprod’s original name, “Indtec,” engraved on the rotor

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.

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Calibre Start Year End Year Jewels Diameter (mm) Height (mm) Complications
SOP 2021/A10-2 2-Button, Chronograph, Date, Modular, Modular Chronograph
Soprod A10-2 2004 2016 25 25.60 3.60 Date, Hacking Seconds, Quick Date Correction
Soprod C105 33 25.60 5.10 Date, Hacking Seconds, Modular, Moon Phase, Quick Date Correction
Soprod C110 29 25.60 5.10 Date, Hacking Seconds, Modular, Quick Date Correction
Soprod C115 31 25.60 5.10 24 Hour Hand, Date, Independently-Adjustable 24 Hour Hand, Modular, Power Reserve Indicator, Quick Date Correction
Soprod C120 2016 Current 25 25.60 5.10 Big Date, Date, Day/Night Indicator, Double Wheel Big Date, GMT Hand, Independently-Adjustable 12 Hour Hand, Modular
Soprod C125 2016 Current 25 25.60 5.67 24 Hour Hand, Date, GMT Hand, Hacking Seconds, Independently-Adjustable 24 Hour Hand, Modular, Quick Date Correction
Soprod C130 27 25.60 5.10 Big Date, Date, Double Wheel Big Date, Modular, Power Reserve Indicator
Soprod C135 25 29.00 5.10 24 Hour Hand, Date, Day, GMT Hand, Hacking Seconds, Independently-Adjustable 24 Hour Hand, Modular, Outer Day Wheel, Quick Date Correction
Soprod C140 27 25.60 5.10 Date, Hacking Seconds, Modular, Power Reserve Indicator, Quick Date Correction
Soprod C145 27 25.60 5.10 Hacking Seconds, Power Reserve Indicator
Soprod M100 Balancier Visible 25 25.60 3.60 Hacking Seconds
Soprod M100 Date 2016 Current 25 25.60 3.60 Date, Hacking Seconds, Hand Winding, Quick Date Correction
Soprod M100 Squelette 25 25.60 3.60 Hacking Seconds

SOP 2021/A10-2

Soprod A10-2

Soprod C105

Soprod C110

Soprod C115

Soprod C120

Soprod C125

Soprod C130

Soprod C135

Soprod C140

Soprod C145

Soprod M100 Balancier Visible

Soprod M100 Date

Soprod M100 Squelette

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