Seiko Cal. 6371 - 321

The Seiko 6371-321 represents an important milestone in Seiko's 1975 lineup. Powered by the 6371 caliber with 33j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-a91a7f216c92]

Also known as: Tuna, World Timer

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

14.8mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Champagne

Jewels

33j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1975

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