Seiko Cal. 3870 - 900

The 3870-900 is a sought-after Spring Drive piece from Seiko's golden era. With its 20mm lug width and 11.0mm profile, it sits comfortably on most wrists. [seikata-wm-197b07f0df80]

Also known as: Tuna, Crown

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

42mm

Case Thickness

11.0mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

110m

Dial Color

Champagne

Jewels

19j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1985

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