Seiko Cal. 6644 - 766

The Seiko 6644-766 represents an important milestone in Seiko's 1970 lineup. The Bidirectional bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-05fe52810e46]

Also known as: World Timer

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

9.0mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

30m

Dial Color

White

Jewels

33j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1970

Related Models

• Seiko 5631-449
• Seiko 5245-334
• Seiko 3863-840
• Seiko 4492-724
• Seiko 6388-802
• Seiko 6645-228
• Seiko 5651-541
• Seiko 4591-634
• Seiko 7154-444
• Seiko 5217-950
• Seiko 6157-736
• Seiko 4435-605