Seiko Cal. 6645 - 581

Released in 1982, the Cal. 6645 with design code 581 was part of Seiko's domestic market collection. With its 21mm lug width and 12.5mm profile, it sits comfortably on most wrists. [seikata-wm-0ebb2aac5748]

Also known as: Navigator, Arnie

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

42mm

Case Thickness

12.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

120m

Dial Color

Navy

Jewels

17j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1982

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