Seiko Cal. 5634 - 681

The 5634-681 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5634 caliber with 35j jewels beating at 21,600 bph, it delivers a 44 hours power reserve. [seikata-wm-62323b0582f9]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

10.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Burgundy

Jewels

35j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1970

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