Seiko Cal. 3877 - 613

Seiko 3877-613

The 3877-613 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3877 caliber with 22j jewels beating at 21,600 bph, it delivers a 38 hours power reserve. [seikata-wm-edf3a5ce3904]

Also known as: Helmet, Baby Tuna

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
41mm
Case Thickness
9.2mm
Lug Width
21mm
Crystal
Acrylic
Bezel
Rotating
Water Resistance
180m
Dial Color
Blue Sunburst
Jewels
22j
Frequency
21,600 bph
Power Reserve
38 hours
Year
1969

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seikata-wm-edf3a5ce3904