Seiko Superior
cal. 9983
Factory Spec. 5 SPY
Thermocompensated: Dual Oscillator (32 kHz + unknown)
User Adjustable: Yes
Dating from the very first year in which Seiko produced these ground-breaking thermocompensated watches, this Superior was also one of the tightest-spec'd Seikos ever produced. This particular watch turns out not to be in original condition, as I had assumed. The bracelet is not a Seiko product and the case has had some minor refinishing (the sides are polished, whereas they should be brushed). Now that I have a second, more completely original Superior, this one is up for sale.
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 | Superior |
| Model Number | unknown |
| Case Number | 8000 |
| Serial Number | 841543 |
| Approx. Date of Manufacture | April 1978 |
| 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! |