Seiko Cal. 6635 - 750

The 6635-750 is a sought-after Spring Drive piece from Seiko's golden era. The Fixed bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-4afb7bc7a02e]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

36mm

Case Thickness

11.6mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

140m

Dial Color

Navy

Jewels

22j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1990

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