| Manufacturer | Sellita |
| Caliber Number | SW221-1, SW 221-1 |
| Movement Type | Automatic, self-winding mechanical |
| Base Caliber | Sellita SW200-1 |
| Lignes | 11.5”’ |
| Overall Diameter | 26mm |
| Casing Diameter | 25.60mm |
| Height | 5.05mm thick |
| Jewels | 26 |
| Power Reserve | ~38 hours |
| Vibrations Per Hour | 28,800, 4Hz |
| Lift Angle | 50 degrees |
| Amplitude Range | 200 degrees – 315 degrees |
| Shock System | Novodiac or Incabloc |
| Regulator System | Etachron with fine tuning device |
| Materials | Brass (main plate and bridges) |
| Rotor Type | Ball bearing |
| Mainpspring | Nivaflex |
| Hand-Windable? | Yes |
| Rotor Winding Direction | Bi-directional |
| Hand Count | 4 |
| Hand Sizes | 1.90mm / 1.50mm / .90mm / .25mm |
| Features | Central hours; central minutes; central sweeping seconds; pointer date aka date hand |
| Hacking Seconds? | Yes |
| Quickset Date? | Yes |
| Country of Manufacture | Switzerland, Swiss made |
| Known Models | Revue Thommen Airspeed, Farer Lomond (Add your watch in comments below…) |
The Sellita caliber SW221-1 is a Swiss made automatic movement with a pointer date style calendar complication.
Based on official technical documentation, this movement has been in production since at least May 7, 2013.
This movement is considered to be an ETA clone and is basically a Sellita version of the pointer date variation of the ETA caliber 2836-2.
Drawings:
Additional Resources:
network of watch sites
Recent Comments
Revelot Veloce R9 series watches use this movement.
ORIENT GP STAINLESS STELL BACK GA058U4-40 B2 JAPAN
The Seiko SRPK31 with this movement has been my daily for the past 3 months…
Tissot pr-516, a 1970s James Bond movie.
Aragon Watch based in USA used this movement in their Divemaster titanium watch in 2024.It…
Now that's a nice looking watch
Thank you for sharing.