Seiko Cal. 6631 - 490

Seiko 6631-490

This Spring Drive model from 1971 features a 46mm Hardlex-Coated Steel case. Powered by the 6631 caliber with 23j jewels beating at 21,600 bph, it delivers a 48 hours power reserve. [seikata-wm-48d2c334e19d]

Also known as: Turtle, Baby Tuna

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
46mm
Case Thickness
9.4mm
Lug Width
20mm
Crystal
Mineral
Bezel
Fixed
Water Resistance
30m
Dial Color
Navy
Jewels
23j
Frequency
21,600 bph
Power Reserve
48 hours
Year
1971

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