Seiko Cal. 6639 - 988

The 6639-988 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6639 caliber with 23j jewels beating at 36,000 bph, it delivers a 53 hours power reserve. [seikata-wm-8f524a810500]

Also known as: Baby Tuna

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

14.9mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

36,000 bph

Power Reserve

53 hours

Year

1970

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