Seiko Cal. 7181 - 231

The Seiko 7181-231 represents an important milestone in Seiko's 1995 lineup. Powered by the 7181 caliber with 31j jewels beating at 28,800 bph, it delivers a 61 hours power reserve. [seikata-wm-c57c731d1c5c]

Also known as: Bellmatic

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

46mm

Case Thickness

11.2mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Black

Jewels

31j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1995

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