Seiko Cal. 5645 - 936

The Seiko 5645-936 represents an important milestone in Seiko's 1977 lineup. With its 21mm lug width and 9.2mm profile, it sits comfortably on most wrists. [seikata-wm-3ca90332c6bb]

Also known as: Bellmatic, Baby Tuna

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

42mm

Case Thickness

9.2mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Black

Jewels

24j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1977

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