SII NE20
Factory specs
- Caliber
- NE20
- Made in
- Japan
- Frequency
- 28,800 bph (4 Hz)
- Power reserve
- 45 h
- Jewels
- 29
- Hacking
- Yes
- Hand winding
- Yes
- Accuracy
- -15 / +25 s/day
- Diameter
- 27.4 mm
- Height
- 6.15 mm
- Functions
- Hours, Minutes, Seconds, Day, Date, Power reserve
Seiko Instruments' automatic with day and date hands and a power-reserve hand. SII technical guide for the NE20C (revised 23 Jan 2019): outside diameter 27.40mm (casing diameter 27.00mm), total height 6.15mm, 29 jewels, 28,800 vph, duration "more than 45 hours" (recorded as 45), static accuracy -15 to +25 s/day (dial up, 9 up and 6 up), posture difference under 45 s over 4 positions, isochronism -10 to +20 s/day, lift angle 52°; three hands, day-date calendar hands and a power-reserve hand; manual winding, ball-bearing automatic winding, stop-second (hacking), quick day and date correction. Caliber Corner lists the subdials as day at 3, date at 6 and power reserve at 9:30, says it is SII's version of Seiko's 6R21 and has been sold since at least 2010 (NE20, NE20A, B, C, with the differences between versions unconfirmed). It gives NE15 as the base caliber, but the NE15 runs at 21,600 vph, so the NE20 is kept in its own family. Tier "mid", alongside the NE15.
Watches with the SII NE20
| Watch | Price from | Movement | Dia. mm | Thick mm | Crystal | Micro-adjust |
|---|---|---|---|---|---|---|
 Aragon Divemaster 4 50mm (Seiko NE20) |
$430 | SII NE20 | 50 | 18 | Sapphire | — |