Seiko Cal. 7187 - 681

The 7187-681 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 7187 caliber with 28j jewels beating at 28,800 bph, it delivers a 59 hours power reserve. [seikata-wm-bf87458abb43]

Also known as: Sumo, Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

44mm

Case Thickness

12.5mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Silver

Jewels

28j

Frequency

28,800 bph

Power Reserve

59 hours

Year

1967

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