Seiko Cal. 6231 - 399

The Seiko 6231-399 represents an important milestone in Seiko's 1981 lineup. The Bidirectional bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-8d4e09f09ec2]

Also known as: Bellmatic

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

36mm

Case Thickness

8.7mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Silver

Jewels

21j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1981

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