Seiko Cal. 6637 - 405

The 6637-405 is a sought-after Hand-Winding piece from Seiko's golden era. It features a White dial protected by a Hardlex crystal and offers 90m of water resistance. [seikata-wm-2174ff7307dc]

Also known as: Baby Tuna, Flighty

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

38mm

Case Thickness

9.4mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

White

Jewels

21j

Frequency

36,000 bph

Power Reserve

65 hours

Year

1975

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