Seiko Cal. 5647 - 231

The 5647-231 is a sought-after Automatic piece from Seiko's golden era. Powered by the 5647 caliber with 28j jewels beating at 21,600 bph, it delivers a 55 hours power reserve. [seikata-wm-63ed5afa8b44]

Also known as: Tuna, Baby Tuna

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

45mm

Case Thickness

12.0mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Black

Jewels

28j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1978

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