Seiko Cal. 4431 - 665

The 4431-665 is a sought-after Spring Drive piece from Seiko's golden era. With its 20mm lug width and 8.8mm profile, it sits comfortably on most wrists. [seikata-wm-a3610e11b58a]

Also known as: Panda, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

8.8mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

70m

Dial Color

Burgundy

Jewels

29j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1973

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