Seiko Cal. 4478 - 378

The 4478-378 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4478 caliber with 29j jewels beating at 36,000 bph, it delivers a 66 hours power reserve. [seikata-wm-856a811cf56f]

Also known as: Sumo, World Timer

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

15.6mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Green

Jewels

29j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1968

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