Seiko Cal. 6391 - 520

The 6391-520 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6391 caliber with 25j jewels beating at 21,600 bph, it delivers a 51 hours power reserve. [seikata-wm-c588cd8df5af]

Also known as: Samurai, Sea Horse

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

35mm

Case Thickness

13.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

90m

Dial Color

Silver

Jewels

25j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1966

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