Seiko Cal. 5620 - 644

The Seiko 5620-644 represents an important milestone in Seiko's 1975 lineup. Powered by the 5620 caliber with 31j jewels beating at 21,600 bph, it delivers a 48 hours power reserve. [seikata-wm-33100d8cc883]

Also known as: Helmet, Sea Horse

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

9.2mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Green

Jewels

31j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1975

Related Models

• Seiko 6123-558
• Seiko 5683-447
• Seiko 3848-215
• Seiko 4565-979
• Seiko 3823-310
• Seiko 4538-409
• Seiko 6691-653
• Seiko 6265-351
• Seiko 5689-975
• Seiko 7139-995
• Seiko 3827-676
• Seiko 0713-536