Seiko Cal. 6181 - 631

The 6181-631 is a sought-after Spring Drive piece from Seiko's golden era. With its 21mm lug width and 15.5mm profile, it sits comfortably on most wrists. [seikata-wm-72feae4a6610]

Also known as: Sumo, Rally

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

46mm

Case Thickness

15.5mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Blue Sunburst

Jewels

17j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1979

Related Models

• Seiko 7183-112
• Seiko 3850-291
• Seiko 3823-131
• Seiko 0717-771
• Seiko 6640-171
• Seiko 7199-642
• Seiko 7044-734
• Seiko 5671-560
• Seiko 4462-220
• Seiko 4485-292
• Seiko 0786-505
• Seiko 4411-742