Seiko Cal. 6658 - 813

Seiko 6658-813

The 6658-813 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6658 caliber with 35j jewels beating at 21,600 bph, it delivers a 71 hours power reserve. [seikata-wm-2c6ae56f7ead]

Also known as: Monster, Sportsmatic

Specifications

Movement
Spring Drive
Case Material
Gold-Plated
Case Width
44mm
Case Thickness
10.7mm
Lug Width
21mm
Crystal
Mineral
Bezel
Bidirectional
Water Resistance
170m
Dial Color
Cream
Jewels
35j
Frequency
21,600 bph
Power Reserve
71 hours
Year
1985

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