Seiko Original-Ersatzteil – Unruhwelle (Balance Staff) – Seikosha (K.K.S.) Typ 新8 [NEU 8] – NOS – (1 Stück) GMT the Reef GMT measures only

the Reef GMT measures only 11

and a slightly domed sapphire crystal that is double anti-reflective on the inside

Accuracy : -20 to +40 seconds per day (at 23°C ± 2°C)

Stones: 23 Jewels

signs of age can be found on the packaging

Seiko Original-Ersatzteil – Unruhwelle (Balance Staff) – Seikosha (K.K.S.) Typ 新8 [NEU 8] – NOS – (1 Stück) GMT the Reef GMT measures onlyOriginal Seiko Seikosha replacement part from new old stock (NOS) genuine balance staff, the central axis of the balance wheel. The balance staff carries the balance wheel and hairspring, and its two fine pivots run in the movement's jewels. It is the most frequently broken component in a mechanical watch movement the pivots typically break due to shocks or falls. This is precisely why a genuine NOS balance staff is a sought after part for restorers;