Seiko Cal. 5641 - 624

The Seiko 5641-624 represents an important milestone in Seiko's 1978 lineup. Powered by the 5641 caliber with 29j jewels beating at 28,800 bph, it delivers a 64 hours power reserve. [seikata-wm-41033919e838]

Also known as: Bullhead

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

44mm

Case Thickness

11.3mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Navy

Jewels

29j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1978

Related Models

• Seiko 3860-441
• Seiko 6690-784
• Seiko 4569-642
• Seiko 7037-145
• Seiko 0737-794
• Seiko 6690-621
• Seiko 6165-859
• Seiko 6283-894
• Seiko 6694-254
• Seiko 4559-376
• Seiko 3884-937
• Seiko 5633-739