Seiko Cal. 6691 - 156

The Seiko 6691-156 represents an important milestone in Seiko's 1974 lineup. Powered by the 6691 caliber with 26j jewels beating at 36,000 bph, it delivers a 36 hours power reserve. [seikata-wm-28befe6bf3cd]

Also known as: Sumo, Tuna

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

44mm

Case Thickness

13.9mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Champagne

Jewels

26j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1974

Related Models

• Seiko 0728-507
• Seiko 6676-881
• Seiko 6232-644
• Seiko 6213-612
• Seiko 0752-148
• Seiko 6153-391
• Seiko 7142-693
• Seiko 6694-800
• Seiko 5610-312
• Seiko 5666-670
• Seiko 3815-860
• Seiko 5680-529