Seiko Cal. 5645 - 728

Released in 1965, the Cal. 5645 with design code 728 was part of Seiko's domestic market collection. With its 22mm lug width and 12.5mm profile, it sits comfortably on most wrists. [seikata-wm-0afca17eeb59]

Also known as: Helmet

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

12.5mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

180m

Dial Color

Navy

Jewels

21j

Frequency

28,800 bph

Power Reserve

62 hours

Year

1965

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