Seiko Cal. 4536 - 550

The Seiko 4536-550 represents an important milestone in Seiko's 1998 lineup. Powered by the 4536 caliber with 27j jewels beating at 36,000 bph, it delivers a 64 hours power reserve. [seikata-wm-eac548b7c604]

Also known as: Sumo, Bellmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

38mm

Case Thickness

14.6mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

200m

Dial Color

Blue Sunburst

Jewels

27j

Frequency

36,000 bph

Power Reserve

64 hours

Year

1998

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