Seiko Cal. 5647 - 635

The Seiko 5647-635 represents an important milestone in Seiko's 1978 lineup. With its 18mm lug width and 14.1mm profile, it sits comfortably on most wrists. [seikata-wm-5227ff1f1669]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

41mm

Case Thickness

14.1mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Green

Jewels

34j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1978

Related Models

• Seiko 7134-174
• Seiko 6663-181
• Seiko 3826-959
• Seiko 4451-758
• Seiko 6122-471
• Seiko 6172-841
• Seiko 6328-806
• Seiko 6353-153
• Seiko 3852-919
• Seiko 7088-501
• Seiko 4520-891
• Seiko 6622-326