From the second photo, I can read that your timer was made in "West Germany", which suggests that the timer is a bit old...
Buying a new one is probably a sensible thing to do. As others have said, you don't want to burn the house down, and reusing old electric devices is an unnecessary source of problems.
Regarding the wiring, I am not a qualified electrician, but I have fitted in recent years two of these timers in apartment buildings halls, and each time they came with very clear wiring instructions.
A