Seiko Cal. 6636 - 240

The Seiko 6636-240 represents an important milestone in Seiko's 1968 lineup. Powered by the 6636 caliber with 23j jewels beating at 36,000 bph, it delivers a 45 hours power reserve. [seikata-wm-82253c2d3950]

Also known as: Baby Tuna

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

8.8mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Black

Jewels

23j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1968

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