Seiko Cal. 6631 - 818

Seiko 6631-818

The Seiko 6631-818 represents an important milestone in Seiko's 1972 lineup. Powered by the 6631 caliber with 17j jewels beating at 36,000 bph, it delivers a 49 hours power reserve. [seikata-wm-31eb0e30b22a]

Also known as: Golden Tuna

Specifications

Movement
Quartz
Case Material
Hardlex-Coated Steel
Case Width
43mm
Case Thickness
14.4mm
Lug Width
21mm
Crystal
Hardlex
Bezel
Rotating
Water Resistance
190m
Dial Color
Silver
Jewels
17j
Frequency
36,000 bph
Power Reserve
49 hours
Year
1972

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