Seiko Cal. 6646 - 378

The Seiko 6646-378 represents an important milestone in Seiko's 1991 lineup. It features a Navy dial protected by a Acrylic crystal and offers 80m of water resistance. [seikata-wm-e04dacf82709]

Also known as: Sportsmatic, Sea Horse

Specifications

Movement

Kinetic

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

13.6mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Navy

Jewels

22j

Frequency

21,600 bph

Power Reserve

47 hours

Year

1991

Related Models

• Seiko 6641-591
• Seiko 5678-244
• Seiko 5624-746
• Seiko 5224-135
• Seiko 6241-510
• Seiko 6642-383
• Seiko 7150-449
• Seiko 6183-663
• Seiko 4512-395
• Seiko 6265-783
• Seiko 7073-771
• Seiko 0750-886