Seiko Cal. 7140 - 648

This Spring Drive model from 1977 features a 35mm Gold-Plated case. Powered by the 7140 caliber with 27j jewels beating at 21,600 bph, it delivers a 69 hours power reserve. [seikata-wm-4b475d93bd81]

Also known as: Sumo, UFO

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

35mm

Case Thickness

14.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Navy

Jewels

27j

Frequency

21,600 bph

Power Reserve

69 hours

Year

1977

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