Seiko Cal. 6131 - 278

The 6131-278 is a sought-after Spring Drive piece from Seiko's golden era. With its 18mm lug width and 10.4mm profile, it sits comfortably on most wrists. [seikata-wm-81eed01bfd9f]

Also known as: Sportsmatic, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

10.4mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

50m

Dial Color

Silver

Jewels

22j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1996

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