Seiko Cal. 7131 - 230

The Seiko 7131-230 represents an important milestone in Seiko's 1966 lineup. Powered by the 7131 caliber with 35j jewels beating at 36,000 bph, it delivers a 44 hours power reserve. [seikata-wm-8749ffdea010]

Also known as: Baby Tuna, Arnie

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

8.5mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Black

Jewels

35j

Frequency

36,000 bph

Power Reserve

44 hours

Year

1966

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