Seiko Cal. 5251 - 636

This Spring Drive model from 1965 features a 39mm Two-Tone case. With its 21mm lug width and 9.0mm profile, it sits comfortably on most wrists. [seikata-wm-54652a42b0a5]

Also known as: Tuna, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

39mm

Case Thickness

9.0mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Green

Jewels

18j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1965

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