Seiko SQ

cal. 9983

Factory Spec. 5 SPY

Thermocompensated: Dual Oscillator (32 kHz + unknown)

User Adjustable: Yes


The frequency of the auxiliary oscillator is not known for sure, but based on a comparison of power requirements between the various Twin Quartz watches in my collection, I believe it is reasonable to assume that the frequency is 40 kHz.

Some details for this watch are missing because it has not completed comprehensive testing.

Parent Company Seiko Holdings Corporation
Brand Seiko
Model Series Twin Quartz
Model Name SQ
Model Number unknown
Case Number 8039
Serial Number 960361
Approx. Date of Manufacture June 1979
Calibre (mvt maker) 9983
Calibre (brand) 9983
Factory SPY 5
TC Appproach Count adjustment & twin quartz
Frequency (XO 1) 32 kHz
Frequency (XO 2) unknown (40 kHz, assumed)
Rate Adjustment User
Major Inhibition Period unknown
Minor Inhibition Period unknown
Power Disposable cell
Cell Number SR927SW
Case Back Cell hatch
Water Resistance unknown
Features 3-hand, no numeral dial
  Day, date (not perpetual)
Timing Results Basic data  &  Further details
Images Photos - Large File Sizes!