Seiko Cal. 5640 - 548

The 5640-548 is a sought-after Automatic piece from Seiko's golden era. Powered by the 5640 caliber with 22j jewels beating at 36,000 bph, it delivers a 39 hours power reserve. [seikata-wm-ac83822886cc]

Also known as: Helmet

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

45mm

Case Thickness

12.3mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

80m

Dial Color

Navy

Jewels

22j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1976

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