Inside it mounts a fully jeweled wristwatch movement (caliber 2609N) while the quite noisy alarm module is marked with the code 38503.
The measurements for this clock are about: 5 cm (~2 in) tall and width (4 cm measuring only the dial circumference without including the feet), that is more or less the size of a double A battery. It is 2.5 cm deep including the setting crowns. It has three crowns one for winding the watch movement, one for winding the alarm and the remaining one for setting time and alarm time.
Some pictures:
