How does one date antique cuckoo clocks?

I’ve inherited a wooden carved antique cuckoo clock manufactured by Hubert Herr from Germany.

It’s been in the family for at least two decades (I’ve been told three, though), which means that it was either manufactured during the 1800’s, or the early 1900’s.

Is there a way to tell for sure?

I’ve also been told that the numbers on the weights can be indicative (the numbers say 1500).

Your feedback will be much appreciated!
Sorry for the typo. I meant three generations, not decades.
To saaanen: I’m well aware that the numbers on the weights refer to the weight. The weight itself can be indicative of the age, though.

Please send me some helpful info – sarcasm is overrated.