Seiko Cal. 5640 - 375

The 5640-375 is a sought-after Hand-Winding piece from Seiko's golden era. It features a White dial protected by a Hardlex crystal and offers 50m of water resistance. [seikata-wm-169d266929aa]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

40mm

Case Thickness

12.0mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

50m

Dial Color

White

Jewels

26j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1987

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