Seiko Cal. 6640 - 685

The 6640-685 is a sought-after Quartz piece from Seiko's golden era. It features a Silver dial protected by a Hardlex crystal and offers 110m of water resistance. [seikata-wm-411fe154928b]

Also known as: Samurai, Golden Tuna

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

34mm

Case Thickness

14.5mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Silver

Jewels

35j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1974

Related Models

• Seiko 5643-728
• Seiko 6320-826
• Seiko 7010-897
• Seiko 6668-490
• Seiko 0735-574
• Seiko 6211-508
• Seiko 4541-119
• Seiko 4426-791
• Seiko 6120-915
• Seiko 7178-675
• Seiko 6220-534
• Seiko 5631-360