Seiko Cal. 5647 - 831

The 5647-831 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5647 caliber with 34j jewels beating at 28,800 bph, it delivers a 61 hours power reserve. [seikata-wm-88e9bc06fb6e]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

36mm

Case Thickness

11.3mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

60m

Dial Color

Black

Jewels

34j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1990

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