The internal components of this are very similar to the clock used in the movie "Groundhog Day". Thanks to this clip I can say the actual flip mechanism is probably identical.
Here it is, in all its digital glory. Take note of the bug lodged behind the plastic - this beautiful device is dirty:
I knew this was going to have some great mechanisms in it before starting, but what I didn't know was that these three screws were going to be the only thing holding it together. EVERYTHING inside was on rails and were held in place by the various knobs connected to the components. Amazing.
Here it is after the back was opened, notice the rail holding the PCB in place on the left and the black tube which holds the hole thing in place with the volume knob. You can also see a nice array of gears used to display what station is currently being tuned:
On the opposite side you can see this strange gear (actually two gears, one has a hole in it that the other fits through) which controls the alarm settings (on/off/recurring/etc) and how long the snooze lasts, between 1-60 minutes:
Everything slid out:
The flip mechanism, notice the little black tab holding the hour in place so that it releases exactly as the minutes turn to 00:
I expect this is what causes all the noise, I wonder if this is also used to keep the time:
I wanted to use this as my nightstand clock, so all the dirty pieces took a bath for a few hours, which worked fairly well but needed some additional scrubbing for all the little ridges:
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