Seiko Cal. 0727 - 637

The 0727-637 is a sought-after Spring Drive piece from Seiko's golden era. With its 22mm lug width and 15.7mm profile, it sits comfortably on most wrists. [seikata-wm-86450e910c24]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

34mm

Case Thickness

15.7mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Silver

Jewels

36j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1983

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