Seiko Cal. 6636 - 441

The 6636-441 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6636 caliber with 35j jewels beating at 28,800 bph, it delivers a 57 hours power reserve. [seikata-wm-6b81281bb733]

Also known as: Panda, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

14.2mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Cream

Jewels

35j

Frequency

28,800 bph

Power Reserve

57 hours

Year

1993

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