Seiko Cal. 5638 - 387

The Seiko 5638-387 represents an important milestone in Seiko's 1992 lineup. It features a Green dial protected by a Hardlex crystal and offers 90m of water resistance. [seikata-wm-4260d04cf7be]

Also known as: Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

45mm

Case Thickness

15.4mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Green

Jewels

29j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1992

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