JDM Seiko Superior Twin Quartz overhauled, accurate /- 5secs year
With Seiko's most accurate quartz movement, this watch rivals even the prestigious Seiko VFA calibre 8N91 and the contemporary Grand Seiko calibre 9f. The Calibre 998X boasts an impressive accuracy rating of 5 seconds per year, making it one of the best movements ever produced by Seiko. The Superior line, which includes the 998X model, remains the most expensive and coveted, with a price tag ranging from 180,000 to 235,000 JPY. Model: Seiko Superior Twin Quartz Year manufactured: July 1979 Ref