Seiko Cal. 6639 - 528

The 6639-528 is a sought-after Spring Drive piece from Seiko's golden era. It features a Silver dial protected by a Mineral crystal and offers 90m of water resistance. [seikata-wm-f2118600d101]

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

37mm

Case Thickness

10.5mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

90m

Dial Color

Silver

Jewels

36j

Frequency

36,000 bph

Power Reserve

46 hours

Year

1974

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