Seiko Cal. 6657 - 609

This Hand-Winding model from 1981 features a 42mm PVD Black case. It features a Burgundy dial protected by a Mineral crystal and offers 30m of water resistance. [seikata-wm-7c2d8e9f43c7]

Also known as: Tuna, Bullhead

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

42mm

Case Thickness

8.4mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Burgundy

Jewels

28j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1981

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