Seiko Cal. 5640 - 771

The 5640-771 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5640 caliber with 23j jewels beating at 21,600 bph, it delivers a 58 hours power reserve. [seikata-wm-fd49eb7b4189]

Also known as: Samurai

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

39mm

Case Thickness

14.3mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Burgundy

Jewels

23j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1992

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