Seiko Cal. 6644 - 646

The Seiko 6644-646 represents an important milestone in Seiko's 1990 lineup. It features a Navy dial protected by a Mineral crystal and offers 200m of water resistance. [seikata-wm-e9221a8a83f3]

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

13.0mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Navy

Jewels

31j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1990

Related Models

• Seiko 6677-682
• Seiko 7172-887
• Seiko 6642-124
• Seiko 6247-188
• Seiko 4549-379
• Seiko 5255-109
• Seiko 4432-998
• Seiko 6638-188
• Seiko 6277-855
• Seiko 7121-514
• Seiko 3892-626
• Seiko 6383-668