Seiko Cal. 5681 - 185

This Spring Drive model from 1977 features a 38mm Hardlex-Coated Steel case. It features a Blue Sunburst dial protected by a Sapphire crystal and offers 170m of water resistance. [seikata-wm-8639aa5c5e8d]

Also known as: Sumo, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

13.6mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

170m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1977

Related Models

• Seiko 5662-639
• Seiko 0773-822
• Seiko 6369-590
• Seiko 7127-451
• Seiko 5675-143
• Seiko 5235-360
• Seiko 4487-219
• Seiko 5246-937
• Seiko 6121-279
• Seiko 6187-678
• Seiko 3887-414
• Seiko 6632-282