Seiko Cal. 6690 - 138

The 6690-138 is a sought-after Solar piece from Seiko's golden era. It features a White dial protected by a Acrylic crystal and offers 90m of water resistance. [seikata-wm-da0c87720cf5]

Also known as: Helmet

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

15.0mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

90m

Dial Color

White

Jewels

21j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1965

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