Seiko Cal. 6678 - 654

The 6678-654 is a sought-after Spring Drive piece from Seiko's golden era. It features a Navy dial protected by a Sapphire crystal and offers 90m of water resistance. [seikata-wm-a59d7617e9f4]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

38mm

Case Thickness

11.0mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

90m

Dial Color

Navy

Jewels

23j

Frequency

36,000 bph

Power Reserve

65 hours

Year

1980

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