Seiko Cal. 3815 - 664

Seiko 3815-664

The 3815-664 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3815 caliber with 23j jewels beating at 36,000 bph, it delivers a 50 hours power reserve. [seikata-wm-e9bcc155f5e3]

Also known as: Rally, Golden Tuna

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
44mm
Case Thickness
10.4mm
Lug Width
18mm
Crystal
Mineral
Bezel
Bidirectional
Water Resistance
70m
Dial Color
Blue Sunburst
Jewels
23j
Frequency
36,000 bph
Power Reserve
50 hours
Year
1973

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