IWC Electronic vintage watch - Tuning Fork - rare blue dial - day and date

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IWC Electronic vintage watch - Tuning Fork - rare blue dial - day and date:
$1119.02

A rare IWC day date in excellent condition and with a new battery installed. All original parts and original dial.
The watch has an electronic oscillator in the form of a tuning fork. This is powered by a miniature battery and divides the time at a frequency of 300 cycles per second. The tuning fork vibrates so rapidly that his movements are no longer observed, but can be perceived carries on the index plate (C) only as buzzing.A refined ratchet system (A) on the vibration of the tuning fork (B), which drives the operation of the clock.
The electronics were produced only in the early 1970s with the total production of only around 30,000.
The electronic and the Edison Electronic (sometimes called the Edison family models) used Max Hetzel ESA 9162/9164, are renamed IWC cal. 150/160. The Cal. 150 (ESA 9162) indicated the date during the 160 (ESA 9164) had day and date functions.