Seiko Cal. 5639 - 720

The 5639-720 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Green dial protected by a Sapphire crystal and offers 60m of water resistance. [seikata-wm-27a5f9580402]

Also known as: Silverwave, Navigator

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

41mm

Case Thickness

8.9mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

60m

Dial Color

Green

Jewels

20j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1965

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