Seiko Cal. 4550 - 161

The Seiko 4550-161 represents an important milestone in Seiko's 1970 lineup. With its 20mm lug width and 11.2mm profile, it sits comfortably on most wrists. [seikata-wm-d08e0f29629d]

Also known as: Sumo

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

11.2mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1970

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