Seiko Cal. 4436 - 445

This Hand-Winding model from 1967 features a 45mm Two-Tone case. Powered by the 4436 caliber with 23j jewels beating at 21,600 bph, it delivers a 58 hours power reserve. [seikata-wm-e71f113df8c6]

Also known as: Sumo, Helmet

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

45mm

Case Thickness

12.5mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

150m

Dial Color

Cream

Jewels

23j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1967

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