Seiko Cal. 6631 - 578

Seiko 6631-578

The 6631-578 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6631 caliber with 30j jewels beating at 36,000 bph, it delivers a 59 hours power reserve. [seikata-wm-8f66d9226a8e]

Specifications

Movement
Spring Drive
Case Material
Gold-Plated
Case Width
36mm
Case Thickness
13.1mm
Lug Width
20mm
Crystal
Sapphire
Bezel
Inner Rotating
Water Resistance
70m
Dial Color
Silver
Jewels
30j
Frequency
36,000 bph
Power Reserve
59 hours
Year
1981

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