Seiko Cal. 4581 - 340

Seiko 4581-340

The 4581-340 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4581 caliber with 17j jewels beating at 21,600 bph, it delivers a 55 hours power reserve. [seikata-wm-14fa29f6a7be]

Also known as: Monster, Sportsmatic

Specifications

Movement
Hand-Winding
Case Material
Stainless Steel
Case Width
41mm
Case Thickness
10.0mm
Lug Width
20mm
Crystal
Hardlex
Bezel
Fixed
Water Resistance
90m
Dial Color
Burgundy
Jewels
17j
Frequency
21,600 bph
Power Reserve
55 hours
Year
1992

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