Seiko Cal. 7131 - 371

Released in 1965, the Cal. 7131 with design code 371 was part of Seiko's domestic market collection. Powered by the 7131 caliber with 29j jewels beating at 36,000 bph, it delivers a 56 hours power reserve. [seikata-wm-89a5155d47db]

Also known as: Baby Tuna

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

37mm

Case Thickness

11.8mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Navy

Jewels

29j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1965

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