Seiko Cal. 5615 - 391

The 5615-391 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5615 caliber with 18j jewels beating at 36,000 bph, it delivers a 59 hours power reserve. [seikata-wm-ae830d383006]

Also known as: Tuna, Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

44mm

Case Thickness

10.6mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

200m

Dial Color

White

Jewels

18j

Frequency

36,000 bph

Power Reserve

59 hours

Year

1980

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