Seiko Cal. 5691 - 938

This Solar model from 1970 features a 36mm Two-Tone case. Powered by the 5691 caliber with 22j jewels beating at 28,800 bph, it delivers a 67 hours power reserve. [seikata-wm-9efefaa7a147]

Also known as: Sumo

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

36mm

Case Thickness

15.9mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Burgundy

Jewels

22j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1970

Related Models

• Seiko 0798-834
• Seiko 5687-680
• Seiko 6359-229
• Seiko 7064-369
• Seiko 3825-874
• Seiko 6697-358
• Seiko 4482-672
• Seiko 4426-795
• Seiko 5661-963
• Seiko 6310-211
• Seiko 7033-968
• Seiko 5277-458