Seiko Cal. 4540 - 870

The Seiko 4540-870 represents an important milestone in Seiko's 1974 lineup. Powered by the 4540 caliber with 27j jewels beating at 36,000 bph, it delivers a 54 hours power reserve. [seikata-wm-9c709c3fc201]

Also known as: Sumo, Bellmatic

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

12.6mm

Lug Width

18mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

170m

Dial Color

Blue Sunburst

Jewels

27j

Frequency

36,000 bph

Power Reserve

54 hours

Year

1974

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