Seiko Cal. 6623 - 640

The Seiko 6623-640 represents an important milestone in Seiko's 1969 lineup. The Coin-Edge bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-d421f16ae04f]

Also known as: Tuna, Crown

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

15.0mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Black

Jewels

36j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1969

Related Models

• Seiko 6632-192
• Seiko 5227-867
• Seiko 6281-783
• Seiko 4542-986
• Seiko 5659-260
• Seiko 0769-813
• Seiko 6674-429
• Seiko 4548-470
• Seiko 0787-544
• Seiko 6329-565
• Seiko 6646-179
• Seiko 4412-949