Seiko Cal. 6331 - 616

The 6331-616 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6331 caliber with 25j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-8343c96adea6]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

37mm

Case Thickness

9.9mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

50m

Dial Color

Green

Jewels

25j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1975

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