Seiko Cal. 0728 - 639

The Seiko 0728-639 represents an important milestone in Seiko's 1988 lineup. It features a Navy dial protected by a Mineral crystal and offers 50m of water resistance. [seikata-wm-99fc0094004d]

Also known as: Navigator

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

43mm

Case Thickness

14.9mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Navy

Jewels

25j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1988

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