You might want to try to get it working yourself first. I've "fixed" over 2 dozen different kinds of old car clocks (my own 68 mustang included) just by taking the back covers off, filing the points on the solenoid contacts & lightly spraying the gears and clock spring with WD40. Nine times out of ten, I've been successful in getting them to work. The only time they didn't work for me is when the clock spring is broken or the solenoid is burned out. After you get it working, bench test it for a few days by powering it up with a 12 volt power supply. There is even an adjustment arm on them to make it run faster or slower if it doesn't keep proper time. Think of it as a miniature grandfather clock that uses a spring and solenoid to wind instead of weights. And like that grandfather clock, it requires occasional maintenance. The oldest one I've "fixed" so far was a 1951 Hudson clock.