Seiko Cal. 6634 - 578

Seiko 6634-578

The 6634-578 is a sought-after Solar piece from Seiko's golden era. Powered by the 6634 caliber with 33j jewels beating at 36,000 bph, it delivers a 65 hours power reserve. [seikata-wm-4228be86bfcc]

Also known as: Bullhead

Specifications

Movement
Solar
Case Material
PVD Black
Case Width
37mm
Case Thickness
13.0mm
Lug Width
21mm
Crystal
Acrylic
Bezel
Bidirectional
Water Resistance
170m
Dial Color
White
Jewels
33j
Frequency
36,000 bph
Power Reserve
65 hours
Year
1985

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