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You are here: Home / Movements / SW400-1

SW400-1

Last Update: June 4, 2019

Brand:Sellita
Family:
Sellita SW200 Family
Height:4.67 mm
Jewels:26
Reserve:38 hours
Frequency:28,800 A/h
Winding:Automatic, Central Rotor Automatic Winding
Diameter:31.00 mm (13.25 ligne)
© Sellita Cal. SW400 has a spacer around the SW200 main plate, allowing a wider and larger date for watches over 40 mm Complications:Date, Hacking Seconds, Quick Date Correction
Hands:Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00
Distinguishing Technical Characteristics
Central-Rotor Automatic
Clockwise Balance Cock
Screw Regulator
Balance at 10:30
Central Rotor
Production: 2014 – Current
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s

Sellita Cal. SW400-1 is an enlarged version of Cal. SW200-1, an automatic movement with date based on the ETA 2824-2 design. Measuring 31.00 mm in diameter, the added width allows a larger date wheel to be fitted.

Sellita SW400 History

Sellita introduced Cal. SW400-1 in in 2014 for the oversized watches that were becoming popular at that time. Variously described as 13.75 or 14 ligne, it pushes the date wheel out to the edge of the dial on watches over 40 mm. It even uses the same main plate as its little brother, with a large “spacer” added to enlarge the movement. A small seconds version, Cal. SW461-1, was added in 2019.

This SW400-1 oiling diagram shows the spacer ring (926) and the SW200-1 components

Sellita SW200 Technical Information

This image from the Sellita SW200 documentation shows the location of the extra jewel between the barrel and gold-colored ratchet wheel

All automatic winding members of the SW200 family include bi-directional winding using a central rotor. The winding mechanism contributes to the overall thickness of the movement, adding 1 mm compared to the more-integrated winding system on the SW300/2892.

The Sellita SW200 design includes an extra jewel (bringing the total to 26) between the barrel and ratchet wheel. This serves mainly as a technical differentiator between the movements and is not an area of deficiency in the original design.

In 2008, Sellita modified the tooth profile of three wheels in the winding system to make them more resistant to shocks and wear. This resulted in the “-1” series of movements (e.g. SW220 became SW220-1). All other components are identical between these movements.

The similar SW400 movements are larger, at 31.00 mm diameter, but are otherwise similar in design and construction.

Sellita SW200 Family

ComplicationsHand Winding CalibresAutomatic Calibres
No DateSW210-1
Date OnlySW215-1SW200-1
SW400-1 (31 mm)
Day-DateSW220-1 MSW220-1
Date by PointerSW221-1 MSW221-1
Outer Day-DateSW240-1 MSW240-1
Small Seconds at 6:00 and DateSW216-1
SW261-1 M
SW260-1
SW261-1
SW461-1 (31 mm)
Moon Phase and DateSW280-1 MSW280-1
Moon Phase, Power Reserve, and DateSW285-1 M a
SW285-1 M b
SW285-1 a
SW285-1 b
Central Moon Phase and DateSW288-1 MSW288-1
Small Seconds at 9:00 and DateSW219-1
SW295-1 M
SW290-1
SW295-1
Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.

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