Seiko Cal. 5646 - 631

This Hand-Winding model from 1977 features a 39mm Two-Tone case. It features a Black dial protected by a Sapphire crystal and offers 40m of water resistance. [seikata-wm-d7495456e716]

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

39mm

Case Thickness

12.9mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

40m

Dial Color

Black

Jewels

17j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1977

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