Seiko Cal. 4438 - 378

Seiko 4438-378

The Seiko 4438-378 represents an important milestone in Seiko's 1997 lineup. Powered by the 4438 caliber with 34j jewels beating at 36,000 bph, it delivers a 51 hours power reserve. [seikata-wm-c7716a2cb0bf]

Also known as: Monster, Helmet

Specifications

Movement
Kinetic
Case Material
Hardlex-Coated Steel
Case Width
44mm
Case Thickness
8.7mm
Lug Width
21mm
Crystal
Acrylic
Bezel
Bidirectional
Water Resistance
90m
Dial Color
White
Jewels
34j
Frequency
36,000 bph
Power Reserve
51 hours
Year
1997

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