Seiko Cal. 6690 - 137

The 6690-137 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6690 caliber with 22j jewels beating at 28,800 bph, it delivers a 40 hours power reserve. [seikata-wm-4c98b656de6e]

Also known as: Tuna, Baby Tuna

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

42mm

Case Thickness

12.9mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Cream

Jewels

22j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1966

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