My guess is late 70's through early 90's , esp. with the music box .
Many of the little die-cast music boxes from this era were imported from asian countries .
You might want to see if you can remove it from the case & inspect it , if you're of a mind to .
The music boxes from germany were worth a little bit more .
If you do decide to take it to a clockmaker , you might want to do the following tests , if you feel comfortable doing so ...( the clock-maker is really a mechanic & does not mind you telling him what works & what does not ... it might help the clock-guy give an estimate too ) .
You can do a preliminary test on the 3 gravity-powered works by threading the chains over the chain-cogs & applying some pressure by pulling on the chain .
There should be one chain for the clock ( you need the pendulum to test this one ) , one for the cuckoos , and one for the music box .
Gently move the hands of the clock to see if 'things' work , while applying pressure (pulling on) to the chain .
The music box should play at the 'hour' , birds chirp @ the 1/4 hrs & main 'chime' ( I didn't see this chime in your pics , but it should be on the access door ) will strike on at least the hour ... sometimes there's alot of noise at 12'o clock !
Most clocks of the size of yours used weights of around 320 grams ( so you'll know about how hard to pull ) .