Seiko Cal. 5640 - 180

The Seiko 5640-180 represents an important milestone in Seiko's 1976 lineup. It features a Silver dial protected by a Sapphire crystal and offers 90m of water resistance. [seikata-wm-ef50269a04cb]

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

42mm

Case Thickness

14.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

90m

Dial Color

Silver

Jewels

26j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1976

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