Seiko Cal. 4436 - 840

Released in 1971, the Cal. 4436 with design code 840 was part of Seiko's domestic market collection. Powered by the 4436 caliber with 28j jewels beating at 21,600 bph, it delivers a 45 hours power reserve. [seikata-wm-dcae225bb617]

Also known as: UFO

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

37mm

Case Thickness

14.9mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

Navy

Jewels

28j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1971

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