Seiko Cal. 6636 - 247

This Spring Drive model from 1978 features a 41mm PVD Black case. With its 21mm lug width and 11.5mm profile, it sits comfortably on most wrists. [seikata-wm-1cf27c1b14bc]

Also known as: Monster

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

41mm

Case Thickness

11.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Green

Jewels

23j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1978

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