Seiko Cal. 5646 - 820

The 5646-820 is a sought-after Spring Drive piece from Seiko's golden era. With its 20mm lug width and 10.4mm profile, it sits comfortably on most wrists. [seikata-wm-168c0ed0ad72]

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

45mm

Case Thickness

10.4mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Champagne

Jewels

29j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1977

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