Seiko Cal. 6638 - 543

The Seiko 6638-543 represents an important milestone in Seiko's 1972 lineup. It features a White dial protected by a Mineral crystal and offers 40m of water resistance. [seikata-wm-305ef1872cf0]

Also known as: Helmet, Golden Tuna

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

35mm

Case Thickness

11.5mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

40m

Dial Color

White

Jewels

28j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1972

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