Seiko Cal. 6691 - 990

The 6691-990 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6691 caliber with 22j jewels beating at 21,600 bph, it delivers a 66 hours power reserve. [seikata-wm-a85363cbfaaf]

Also known as: Tuna, Goldfeather

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

45mm

Case Thickness

9.3mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Green

Jewels

22j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1968

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