Seiko Cal. 6690 - 310

The 6690-310 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Green dial protected by a Hardlex crystal and offers 130m of water resistance. [seikata-wm-6a10af23e1c8]

Also known as: Tuna, Bullhead

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

15.2mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Green

Jewels

21j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1987

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