Seiko Cal. 4550 - 101

The 4550-101 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4550 caliber with 24j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-ed7a967d2b55]

Also known as: Shogun, Tuna

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

46mm

Case Thickness

15.1mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Blue Sunburst

Jewels

24j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1977

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