Seiko Cal. 7187 - 550

The Seiko 7187-550 represents an important milestone in Seiko's 1969 lineup. Powered by the 7187 caliber with 32j jewels beating at 28,800 bph, it delivers a 42 hours power reserve. [seikata-wm-39b015a15246]

Also known as: Sumo, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

42mm

Case Thickness

15.3mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Silver

Jewels

32j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1969

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