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SW500 M MP c

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Brand:Sellita
Family:
Height:7.00 mm
Jewels:21
Reserve:58 hours
Frequency:28,800 A/h
Winding:Hand winding
Diameter:30.00 mm (13.25 ligne)
  Complications:Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph, Quick Date Correction
Hands:Central 60 Second Chronograph Hand, Central Hour Hand, Central Minute Hand, Date Window at 3:00, Small Seconds Hand at 9:00
Distinguishing Technical Characteristics
Hand-Winding
Clockwise Balance Cock
Screw Regulator
Balance at 1:30
Production: 2018 – Current
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s

Sellita Cal. SW500 M MP c is a hand-winding monopusher chronograph movement in the Sellita SW500 family. It is based on the ETA 7750 design and shares many components with that movement. Sellita introduced the monopusher MP function in 2018 along with the hand-winding version of the SW500 line. All hand-winding SW500 M movements feature a special bridge with larger jewels and a cut-out to allow the cam-switching chronograph function to be visible through a display caseback.

This movement features a single button at 2:00 for chronograph start/stop/reset. It has running small seconds at 9:00 and a date window at 3:00. There are no other chronograph counters.

Sellita SW500 and SW600 Technical Information

The Sellita SW500 and SW600 movements are based on the Valjoux 7750 design, itself based on the Valjoux 7733 and Venus 188. This movement is known for durability and flexibility and is used as a base in many watches, from entry-level chronographs to the famous IWC “Il Destriero Scafusia” grande complication. It is a large and relatively thick movement, measuring 13.25 ligne (30.00 mm) in diameter and 7.90 mm thick.

Although based on a classic design, the modern SW500 and SW600 is robust and full-featured. It operates at 4 Hz (28,800 A/h) with an efficient uni-directional central winding rotor. The day and date wheels feature crown-operated quick correction and a stop seconds (“hacking”) feature is included. The base movement has the famous Valjoux 6-9-12 subdial layout with small seconds at 9:00, but many Sellita versions have other subdial designs.

One major differentiator for the Sellita movements is the use of an eccentric screw for regulation rather than the traditional Valjoux articulated index.

ETA/Valjoux uses a two-piece index regulator with a movable pointer on the 7750
Sellita uses an eccentric screw regulator on all of its movements, including the SW500

Sellita 500 M MP Variants

Date at 6:00
Chonograph Minutes at 12:00		Date at 3:00
Chronograph Minutes at 12:00
Small Seconds at 9:00		Date at 3:00
Small Seconds at 9:00
No Chronograph CountersSW500 M MP c
30 Minute CounterSW500 M MP aSW500 M MP b
15 Minute CounterSW501 M MP aSW501 M MP b
Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.