Seiko Cal. 6637 - 381

The Seiko 6637-381 represents an important milestone in Seiko's 1965 lineup. It features a Silver dial protected by a Mineral crystal and offers 40m of water resistance. [seikata-wm-585f6d89d321]

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

42mm

Case Thickness

15.1mm

Lug Width

19mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Silver

Jewels

30j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1965

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