Seiko Cal. 4550 - 539

The Seiko 4550-539 represents an important milestone in Seiko's 1966 lineup. It features a Navy dial protected by a Acrylic crystal and offers 120m of water resistance. [seikata-wm-7d4656a9d375]

Also known as: Tuna, UFO

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

42mm

Case Thickness

10.9mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Navy

Jewels

32j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1966

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