Seiko Cal. 4577 - 641

This Spring Drive model from 1968 features a 37mm Two-Tone case. It features a Black dial protected by a Acrylic crystal and offers 180m of water resistance. [seikata-wm-77cc0f03d4ba]

Also known as: Sumo, Panda

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

37mm

Case Thickness

10.5mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Black

Jewels

35j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1968

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