Seiko Cal. 6640 - 155

The Seiko 6640-155 represents an important milestone in Seiko's 1976 lineup. Powered by the 6640 caliber with 23j jewels beating at 36,000 bph, it delivers a 40 hours power reserve. [seikata-wm-6e3aae22b6fd]

Also known as: Samurai, Golden Tuna

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

13.3mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Silver

Jewels

23j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1976

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