Seiko Cal. 4420 - 645

The Seiko 4420-645 represents an important milestone in Seiko's 1977 lineup. Powered by the 4420 caliber with 18j jewels beating at 21,600 bph, it delivers a 60 hours power reserve. [seikata-wm-a7486a65ab13]

Also known as: Pogue, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

15.0mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Blue Sunburst

Jewels

18j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1977

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