Seiko Cal. 6634 - 621

The 6634-621 is a sought-after Spring Drive piece from Seiko's golden era. It features a White dial protected by a Sapphire crystal and offers 50m of water resistance. [seikata-wm-f0bd766efc4f]

Also known as: Silverwave, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

44mm

Case Thickness

8.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

50m

Dial Color

White

Jewels

32j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1979

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