Seiko Cal. 5631 - 305

The 5631-305 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5631 caliber with 20j jewels beating at 36,000 bph, it delivers a 54 hours power reserve. [seikata-wm-d9b61e3821e5]

Also known as: Samurai

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

38mm

Case Thickness

14.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

190m

Dial Color

Navy

Jewels

20j

Frequency

36,000 bph

Power Reserve

54 hours

Year

1997

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