Seiko Cal. 4427 - 877

The Seiko 4427-877 represents an important milestone in Seiko's 1987 lineup. Powered by the 4427 caliber with 36j jewels beating at 21,600 bph, it delivers a 44 hours power reserve. [seikata-wm-3709584e313a]

Also known as: Helmet, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

41mm

Case Thickness

15.7mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

90m

Dial Color

White

Jewels

36j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1987

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