Seiko Cal. 6687 - 538

The 6687-538 is a sought-after Solar piece from Seiko's golden era. It features a Navy dial protected by a Hardlex crystal and offers 180m of water resistance. [seikata-wm-e03fb5a1271c]

Also known as: Monster, Navigator

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

35mm

Case Thickness

10.3mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Navy

Jewels

23j

Frequency

21,600 bph

Power Reserve

46 hours

Year

1974

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