Seiko Cal. 5618 - 639

Released in 1997, the Cal. 5618 with design code 639 was part of Seiko's domestic market collection. With its 21mm lug width and 15.7mm profile, it sits comfortably on most wrists. [seikata-wm-eab8db48073d]

Also known as: Sumo, UFO

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

15.7mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Black

Jewels

23j

Frequency

36,000 bph

Power Reserve

44 hours

Year

1997

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