Seiko Cal. 6681 - 645

The Seiko 6681-645 represents an important milestone in Seiko's 1983 lineup. It features a Silver dial protected by a Hardlex crystal and offers 140m of water resistance. [seikata-wm-cb3406681a6b]

Also known as: Monster, World Timer

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

37mm

Case Thickness

8.1mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

140m

Dial Color

Silver

Jewels

23j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1983

Related Models

• Seiko 5253-169
• Seiko 6326-966
• Seiko 7193-238
• Seiko 6213-581
• Seiko 0762-695
• Seiko 7124-170
• Seiko 5237-912
• Seiko 3854-211
• Seiko 7158-648
• Seiko 6369-147
• Seiko 6248-424
• Seiko 7051-451