Here is a very rare model made in the mid-1970s, huge, massive, it leaves a striking impression on every observer. This is Jump Hour mechanical-digital watch.
Inside watch is Tenor Dorly 1393 calibre, Swiss made 21 jewels movement, working perfect.
The most common failures in these watches are because set the time incorrectly, more precisely, when you setting the time never turn time back, if you do that you risk of cracking some parts in movement.
Enjoy the photos because something like this is rarely seen...