Seiko Cal. 3877 - 521

The 3877-521 is a sought-after Automatic piece from Seiko's golden era. Powered by the 3877 caliber with 24j jewels beating at 36,000 bph, it delivers a 60 hours power reserve. [seikata-wm-b4c3cf4e86f7]

Also known as: Rally, Flighty

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

11.4mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

110m

Dial Color

Black

Jewels

24j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1966

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