Seiko Cal. 7138 - 310

Released in 1966, the Cal. 7138 with design code 310 was part of Seiko's domestic market collection. With its 22mm lug width and 10.5mm profile, it sits comfortably on most wrists. [seikata-wm-dd1fdb0ae17c]

Also known as: Sumo, Rally

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

46mm

Case Thickness

10.5mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

120m

Dial Color

White

Jewels

32j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1966

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