Seiko Cal. 5631 - 853

The 5631-853 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5631 caliber with 36j jewels beating at 28,800 bph, it delivers a 68 hours power reserve. [seikata-wm-0ed44e3eefb7]

Also known as: Baby Tuna, Flighty

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

35mm

Case Thickness

15.1mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

70m

Dial Color

Silver

Jewels

36j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1972

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