Seiko Cal. 4561 - 990

The Seiko 4561-990 represents an important milestone in Seiko's 1975 lineup. It features a Blue Sunburst dial protected by a Acrylic crystal and offers 30m of water resistance. [seikata-wm-a71fd5afaed5]

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

36mm

Case Thickness

11.3mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

30m

Dial Color

Blue Sunburst

Jewels

26j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1975

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