Sellita SW300-1
Factory specs
- Caliber
- SW300-1
- Made in
- Switzerland
- Frequency
- 28,800 bph (4 Hz)
- Power reserve
- 56 h
- Jewels
- 25
- Hacking
- Yes
- Hand winding
- Yes
- Accuracy
- —
- Diameter
- 25.6 mm
- Height
- 3.6 mm
- Functions
- Hours, Minutes, Seconds, Date
- Clone of
- ETA 2892-A2
- Same family
- Sellita SW360-1
Factory grades
| Grade | Accuracy | Notes |
|---|---|---|
| Elaboré | 0 / +10 s/day | Mean rate 5 ±5 s/day, max. divergence 20 s/day, 4 positions (CH, 6H, 9H, 3H); isochronism ±15 s/day. Often marketed as "Special". |
| Top | 0 / +8 s/day | Mean rate 4 ±4 s/day, max. divergence 15 s/day, 5 positions; isochronism ±10 s/day. Often marketed as "Premium". |
| Chronomètre | -4 / +6 s/day | COSC criteria |
Sellita's thin automatic, the counterpart of the ETA 2892-A2 (1.00mm slimmer than the SW200-1). Sellita technical documentation and 2026-27 catalogue: case fitting Ø25.60mm (overall Ø26.20mm), 3.60mm high, 25 jewels, 28,800 vph, power reserve minimum 50h / typical 56h, lift angle 51°, Incabloc, stop-second, ball-bearing rotor, quick date. "SW300-1 a" has the date; "SW300-1 b" is a true no-date. Earlier SW300-1s had about 42h; Caliber Corner reports the 56h figure came with Sellita's newer barrel, so older watches may quote 42h.
