Seiko Cal. 5638 - 498

The Seiko 5638-498 represents an important milestone in Seiko's 1986 lineup. Powered by the 5638 caliber with 30j jewels beating at 36,000 bph, it delivers a 42 hours power reserve. [seikata-wm-dca2ed401c62]

Also known as: Sportsmatic, World Timer

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

41mm

Case Thickness

14.2mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

110m

Dial Color

Burgundy

Jewels

30j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1986

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