Sellita SW500 Family

BRANDS: Sellita

Production: 2009 – Current
1910s	1920s	1930s	1940s	1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s

Sellita’s SW500 and SW600 family is a group of automatic chronograph movements based on the Valjoux 7750 design. The Sellita SW500 family is considered a clone of the ETA/Valjoux 7750 family, though there are many more variations available in this Sellita line. Many parts are interchangeable between these movements and their ETA cousins, however. Additionally, Sellita now makes a line of movements, known as the SW600 family, which lack the chronograph complication but are based on the same basic design.

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 SW500 Chronograph Movements

Sellita makes a wide assortment of variations on the basic 7750 design. Movements ending in “0” feature a 30 minute chronograph counter, while those ending in “1” have a 15 minute counter. The monopusher “MP” movements have a separate pusher at 2:00 while the “MPC” movements have a pusher coaxial with the crown. The “BV” family has a “Bicompax Vertical” layout (subdials at 6 and 12) without running small seconds at 9:00 while the “BH” movements have a “Bicompax Horizontal” layout (subdials at 3 and 9) with small seconds.

Complications	Hand-Winding Calibres	Automatic Calibres
6-9-12 Day-Date	SW500 M a SW501 M a	SW500 a SW501 a
6-9-12 Date	SW500 M b SW501 M b	SW500 b SW501 b
6-9-12 No Date	SW500 M c SW501 M c	SW500 c SW501 c
6-12 Day-Date	SW500 M BV a SW501 M BV a	SW500 BV a SW501 BV a
6-12 Date	SW500 M BV b SW501 M BV b	SW500 BV b SW501 BV b
6-12 No Date	SW500 M BV c SW501 M BV c	SW500 BV c SW501 BV c
Monopusher 12 Date	SW500 M MP a SW501 M MP a SW500 M MPC a SW501 M MPC a	SW500 MP a SW501 MP a SW500 MPC a SW501 MPC a
Monopusher 9-12 Date	SW500 M MP b SW501 M MP b SW500 M MPC b SW501 M MPC b	SW500 MP b SW501 MP b SW500 MPC a SW501 MPC a
Monopusher 9 Date	SW500 M MP c SW500 M MPC c	SW500 MP c SW500 MPC c
3-6-9 Date	SW510 M a SW511 M a	SW510 a SW511 a
3-6-9 No Date	SW510 M b SW511 M b	SW510 b SW511 b
3-9 Date	SW510 M BH a SW511 M BH a	SW510 BH a SW511 BH a
3-9 No Date	SW510 M BH b SW511 M BH b	SW510 BH b SW511 BH b
3 Date	SW510 M BH c SW511 M BH c	SW510 BH c SW511 BH c
Monopusher 3-9 Date	SW510 M MP a SW511 M MP a SW510 M MPC a SW511 M MPC a	SW510 MP a SW511 MP a SW510 MPC a SW511 MPC a
Monopusher 3-9 No Date	SW510 M MP b SW511 M MP b SW510 M MPC b SW511 M MPC b	SW510 MP b SW511 MP b SW510 MPC b SW511 MPC b
Monopusher 3 Date	SW510 M MP c SW511 M MP c SW510 M MPC c SW511 M MPC c	SW510 MP c SW511 MP c SW510 MPC c SW511 MPC c

Sellita SW600 Non-Chronograph Movements

In addition to the SW500 chronograph movements, Sellita also makes time-only movements based on the Valjoux 7750 design. These SW600 movements are available with central seconds or small seconds. Unlike the conceptually-similar Valgranges movements from ETA, which are oversized, these measure 13.25 ligne (30.00 mm) diameter like their chronograph cousins.

Complications	Central Seconds Calibres	Small Seconds Calibres
Day-Date	SW600 a	SW690 a
Date	SW600 b	SW690 b

Sellita SW500 and SW600 History

The SW500 family was launched in 2009 just after the SW200 (ETA 2824 clone) and SW300 (ETA 2892 clone). Sellita had long been a contract manufacturer for ETA, building and re-selling the 2600, 2800, 2890, and 7001 series until 2008. Although they did not list the 7750 in their catalog, they were able to secure components from suppliers to begin production on their clone movement just a few years after shifting to “in-house” manufacturing.

Sellita initially offered just a basic ETA 7750 clone called Cal. SW500. This was in widespread use by 2011, with many watch makers outside the Swatch Group switching to the Sellita version. It was especially popular with lower-priced makers like Invicta, Glycine, and Sinn but even Breitling and Rolex’s Tudor were early customers.

In 2017, Sellita introduced the SW510 series, a clone of the ETA 7753 with a 3-6-9 subdial layout. This movement may have been in use earlier but this was the first public use of the SW510 name.

2018 saw a massive expansion of the SW500 line, with hand-winding “M” movements added along with monopusher “MP” and “MPC” movements. This was also the debut of the time-and-date SW600 and SW690 movements. In all, over a dozen new variants were introduced. 2019 saw a further expansion with 8 more variants. In all, over four dozen different movements are offered as of 2020.

Calibre	Start Year	End Year	Diameter (mm)	Diameter (ligne)	Height (mm)	Complications
SW500 a	2009	Current	30.00	13.25	7.90	2-Button, Cam Switching Chronograph, Chronograph, Date, Day, Hacking Seconds, Quick Date Correction
SW500 b	2017	Current	30.00	13.25	7.90	2-Button, Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Quick Date Correction
SW500 BV a	2018	Current	30.00	13.25	7.90	2-Button, Cam Switching Chronograph, Chronograph, Date, Day, Hacking Seconds, Quick Date Correction
SW500 BV b	2018	Current	30.00	13.25	7.90	2-Button, Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Quick Date Correction
SW500 BV c	2018	Current	30.00	13.25	7.90	2-Button, Cam Switching Chronograph, Chronograph, Hacking Seconds
SW500 c	2017	Current	30.00	13.25	7.90	2-Button, Cam Switching Chronograph, Chronograph, Hacking Seconds
SW500 M a	2018	Current	30.00	13.25	7.00	2-Button, Cam Switching Chronograph, Chronograph, Date, Day, Hacking Seconds, Quick Date Correction
SW500 M b	2018	Current	30.00	13.25	7.00	2-Button, Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Quick Date Correction
SW500 M BV a	2018	Current	30.00	13.25	7.00	2-Button, Cam Switching Chronograph, Chronograph, Date, Day, Hacking Seconds, Quick Date Correction
SW500 M BV b	2018	Current	30.00	13.25	7.00	2-Button, Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Quick Date Correction
SW500 M BV c	2018	Current	30.00	13.25	7.00	2-Button, Cam Switching Chronograph, Chronograph, Hacking Seconds
SW500 M c	2018	Current	30.00	13.25	7.00	2-Button, Cam Switching Chronograph, Chronograph, Hacking Seconds
SW500 M MP a	2018	Current	30.00	13.25	7.00	Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph, Quick Date Correction
SW500 M MP b	2018	Current	30.00	13.25	7.90	Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph, Quick Date Correction
SW500 M MP c	2018	Current	30.00	13.25	7.00	Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph, Quick Date Correction
SW500 M MPC a	2018	Current	30.00	13.25	7.00	Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph, Quick Date Correction
SW500 M MPC b	2018	Current	30.00	13.25	7.90	Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph, Quick Date Correction
SW500 M MPC c	2018	Current	30.00	13.25	7.00	Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph, Quick Date Correction
SW500 MP a	2018	Current	30.00	13.25	7.90	Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph, Quick Date Correction
SW500 MP b	2018	Current	30.00	13.25	7.90	Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph, Quick Date Correction
SW500 MP c	2018	Current	30.00	13.25	7.90	Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph, Quick Date Correction
SW500 MPC a	2018	Current	30.00	13.25	7.90	Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph, Quick Date Correction
SW500 MPC b	2018	Current	30.00	13.25	7.90	Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph
SW500 MPC c	2018	Current	30.00	13.25	7.90	Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph
SW501 a	2017	Current	30.00	13.25	7.90	2-Button, Cam Switching Chronograph, Chronograph, Date, Day, Hacking Seconds, Quick Date Correction
SW501 b	2017	Current	30.00	13.25	7.90	2-Button, Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Quick Date Correction
SW501 BV a	2018	Current	30.00	13.25	7.90	2-Button, Cam Switching Chronograph, Chronograph, Date, Day, Hacking Seconds, Quick Date Correction
SW501 BV b	2018	Current	30.00	13.25	7.90	2-Button, Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Quick Date Correction
SW501 BV c	2018	Current	30.00	13.25	7.90	2-Button, Cam Switching Chronograph, Chronograph, Hacking Seconds
SW501 c	2017	Current	30.00	13.25	7.90	2-Button, Cam Switching Chronograph, Chronograph, Hacking Seconds
SW501 M a	2018	Current	30.00	13.25	7.00	2-Button, Cam Switching Chronograph, Chronograph, Date, Day, Hacking Seconds, Quick Date Correction
SW501 M b	2018	Current	30.00	13.25	7.00	2-Button, Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Quick Date Correction
SW501 M BV a	2018	Current	30.00	13.25	7.00	2-Button, Cam Switching Chronograph, Chronograph, Date, Day, Hacking Seconds, Quick Date Correction
SW501 M BV b	2018	Current	30.00	13.25	7.00	2-Button, Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Quick Date Correction
SW501 M BV c	2018	Current	30.00	13.25	7.00	2-Button, Cam Switching Chronograph, Chronograph, Hacking Seconds
SW501 M c	2018	Current	30.00	13.25	7.00	2-Button, Cam Switching Chronograph, Chronograph, Hacking Seconds
SW501 M MP a	2018	Current	30.00	13.25	7.00	Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph, Quick Date Correction
SW501 M MP b	2018	Current	30.00	13.25	7.90	Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph, Quick Date Correction
SW501 M MPC a	2018	Current	30.00	13.25	7.00	Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph, Quick Date Correction
SW501 M MPC b	2018	Current	30.00	13.25	7.90	Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph, Quick Date Correction
SW501 MP a	2018	Current	30.00	13.25	7.90	Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph, Quick Date Correction
SW501 MP b	2018	Current	30.00	13.25	7.90	Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph, Quick Date Correction
SW501 MPC a	2018	Current	30.00	13.25	7.90	Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph, Quick Date Correction
SW501 MPC b	2018	Current	30.00	13.25	7.90	Cam Switching Chronograph, Chronograph, Date, Hacking Seconds, Monopusher Chronograph