Seiko Cal. 5640 - 521

The Seiko 5640-521 represents an important milestone in Seiko's 1975 lineup. It features a Silver dial protected by a Acrylic crystal and offers 80m of water resistance. [seikata-wm-766d29a7a323]

Also known as: Silverwave, Bellmatic

Specifications

Movement

Solar

Case Material

Titanium

Case Width

35mm

Case Thickness

12.1mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

80m

Dial Color

Silver

Jewels

21j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1975

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