Seiko Cal. 5640 - 436

This Automatic model from 1965 features a 40mm Hardlex-Coated Steel case. Powered by the 5640 caliber with 19j jewels beating at 36,000 bph, it delivers a 51 hours power reserve. [seikata-wm-9d1dc6167d8c]

Also known as: Goldfeather

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

10.4mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

150m

Dial Color

Black

Jewels

19j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1965

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