Seiko Cal. 6390 - 644

The 6390-644 is a sought-after Spring Drive piece from Seiko's golden era. The Fixed bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-373c8662d20b]

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

37mm

Case Thickness

9.3mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

150m

Dial Color

White

Jewels

28j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1987

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