Seiko Cal. 3870 - 403

The 3870-403 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 3870 caliber with 23j jewels beating at 28,800 bph, it delivers a 46 hours power reserve. [seikata-wm-5473f7b3ace6]

Also known as: Tuna, Helmet

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

44mm

Case Thickness

15.5mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

170m

Dial Color

Black

Jewels

23j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1994

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