Seiko Cal. 6688 - 978

The 6688-978 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Black dial protected by a Sapphire crystal and offers 160m of water resistance. [seikata-wm-437ce729f736]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

8.0mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

160m

Dial Color

Black

Jewels

26j

Frequency

36,000 bph

Power Reserve

64 hours

Year

1978

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