Seiko Cal. 5231 - 870

The Seiko 5231-870 represents an important milestone in Seiko's 1970 lineup. Powered by the 5231 caliber with 36j jewels beating at 21,600 bph, it delivers a 58 hours power reserve. [seikata-wm-2ec329886fad]

Also known as: Shogun, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

13.1mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

40m

Dial Color

Black

Jewels

36j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1970

Related Models

• Seiko 4441-450
• Seiko 3811-665
• Seiko 4492-839
• Seiko 0755-655
• Seiko 6259-917
• Seiko 6134-181
• Seiko 6193-298
• Seiko 6213-265
• Seiko 7111-534
• Seiko 0778-105
• Seiko 0756-483
• Seiko 7032-386