Seiko Cal. 6387 - 331

The Seiko 6387-331 represents an important milestone in Seiko's 1971 lineup. Powered by the 6387 caliber with 33j jewels beating at 36,000 bph, it delivers a 48 hours power reserve. [seikata-wm-2e0b1c31af48]

Also known as: Tuna, Bellmatic

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

36mm

Case Thickness

14.9mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

120m

Dial Color

Cream

Jewels

33j

Frequency

36,000 bph

Power Reserve

48 hours

Year

1971

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