Seiko Cal. 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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