Seiko Cal. 4550 - 633

The 4550-633 is a sought-after Hand-Winding piece from Seiko's golden era. The Rotating bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-5b1faf87fee4]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

46mm

Case Thickness

10.3mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

90m

Dial Color

Green

Jewels

32j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1978

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