Seiko Cal. 5644 - 164

The Seiko 5644-164 represents an important milestone in Seiko's 1987 lineup. The Rotating bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-ec30748428a4]

Also known as: Bullhead

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

39mm

Case Thickness

12.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

190m

Dial Color

Silver

Jewels

25j

Frequency

21,600 bph

Power Reserve

47 hours

Year

1987

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