Seiko Cal. 6678 - 644

The Seiko 6678-644 represents an important milestone in Seiko's 1976 lineup. The Coin-Edge bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-fcf34c6d109d]

Also known as: Samurai, Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

9.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Silver

Jewels

18j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1976

Related Models

• Seiko 6225-459
• Seiko 7195-248
• Seiko 0797-303
• Seiko 6134-979
• Seiko 5255-314
• Seiko 6229-530
• Seiko 5667-659
• Seiko 0780-959
• Seiko 3890-521
• Seiko 7180-937
• Seiko 4592-262
• Seiko 4424-575