Seiko Cal. 4550 - 678

This Spring Drive model from 1983 features a 40mm Two-Tone case. Powered by the 4550 caliber with 34j jewels beating at 28,800 bph, it delivers a 61 hours power reserve. [seikata-wm-0727623e3f23]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

40mm

Case Thickness

15.0mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

30m

Dial Color

Navy

Jewels

34j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1983

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