Seiko Cal. 5644 - 487

The Seiko 5644-487 represents an important milestone in Seiko's 1968 lineup. The Coin-Edge bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-3cb061117185]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

9.5mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

Silver

Jewels

26j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1968

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