Seiko Cal. 5644 - 988

The Seiko 5644-988 represents an important milestone in Seiko's 1970 lineup. Powered by the 5644 caliber with 26j jewels beating at 28,800 bph, it delivers a 47 hours power reserve. [seikata-wm-3d048018bfe4]

Also known as: Monster, Crown

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

9.7mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Silver

Jewels

26j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1970

Related Models

• Seiko 6179-332
• Seiko 4540-210
• Seiko 7160-862
• Seiko 7023-921
• Seiko 0764-549
• Seiko 4479-376
• Seiko 5698-105
• Seiko 5688-840
• Seiko 7121-154
• Seiko 6133-180
• Seiko 5281-313
• Seiko 7076-851