Seiko Cal. 4556 - 641

The Seiko 4556-641 represents an important milestone in Seiko's 1977 lineup. It features a Green dial protected by a Mineral crystal and offers 170m of water resistance. [seikata-wm-d969bf499d84]

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

13.0mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Green

Jewels

34j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1977

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