Citizen Exceed

cal. A670

Factory Spec. 10 SPY

Thermocompensated: Thermistor

User Adjustable: No

I acquired this watch together with the 4 MHz Exceed, in a swap for my SLT019P1 and a cal. 9983 Seiko Superior. It is similar in appearance to my EBJ74, although it is not solar-powered and its calendar is not perpetual. Opening the back revealed that the battery clamp is damaged and partly held in place by Blu-Tack.

I have put this watch down (along with the AQ1000-58B and Exceed 0330) as having a thermistor and count adjustment, but I am beginning to doubt that theory. Citizen and Seiko are both rather more reluctant than ETA to share the details of how their watches achieve their SPY values. It had commonly been assumed that Citizen used digital count adjustment (and this may still turn out to be the case), but an investigation with a Witschi QT-6000 by a WUS forum member suggests that the 0330 and E510 (and, by extension, possibly all high-end Citizen movements) actually vary the frequency of the oscillator.

I gave this watch away to a watchmaker who was looking for just such an example in exchange for his expert help with my Exceed 4 Mega.