Seiko Cal. 4541 - 638

Seiko 4541-638

The Seiko 4541-638 represents an important milestone in Seiko's 1984 lineup. Powered by the 4541 caliber with 28j jewels beating at 36,000 bph, it delivers a 61 hours power reserve. [seikata-wm-d1ba389ff089]

Also known as: Monster, UFO

Specifications

Movement
Hand-Winding
Case Material
Hardlex-Coated Steel
Case Width
44mm
Case Thickness
10.6mm
Lug Width
20mm
Crystal
Acrylic
Bezel
Fixed
Water Resistance
110m
Dial Color
Silver
Jewels
28j
Frequency
36,000 bph
Power Reserve
61 hours
Year
1984

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