Seiko Cal. 4550 - 391

The Seiko 4550-391 represents an important milestone in Seiko's 1976 lineup. Powered by the 4550 caliber with 27j jewels beating at 36,000 bph, it delivers a 57 hours power reserve. [seikata-wm-a4abcad51506]

Also known as: Baby Tuna, Flighty

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

15.8mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Navy

Jewels

27j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1976

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