Seiko Cal. 4578 - 991

The Seiko 4578-991 represents an important milestone in Seiko's 1974 lineup. The Bidirectional bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-6f39aa00fbd6]

Also known as: Bullhead, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

43mm

Case Thickness

14.2mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

190m

Dial Color

Champagne

Jewels

25j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1974

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