Seiko Cal. 6366 - 856

The 6366-856 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6366 caliber with 25j jewels beating at 21,600 bph, it delivers a 48 hours power reserve. [seikata-wm-ab389f21acc8]

Also known as: Tuna, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

15.5mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

40m

Dial Color

Blue Sunburst

Jewels

25j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1970

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