Seiko Cal. 6377 - 640

The Seiko 6377-640 represents an important milestone in Seiko's 1976 lineup. Powered by the 6377 caliber with 36j jewels beating at 36,000 bph, it delivers a 46 hours power reserve. [seikata-wm-c2ae07a48ed3]

Also known as: Baby Tuna

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

39mm

Case Thickness

11.8mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

60m

Dial Color

Burgundy

Jewels

36j

Frequency

36,000 bph

Power Reserve

46 hours

Year

1976

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