Seiko Cal. 4438 - 918

The 4438-918 is a sought-after Automatic piece from Seiko's golden era. Powered by the 4438 caliber with 34j jewels beating at 36,000 bph, it delivers a 71 hours power reserve. [seikata-wm-d3231405fda4]

Also known as: Sumo, Bellmatic

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

45mm

Case Thickness

13.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Blue Sunburst

Jewels

34j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1991

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