I found this interesting collection of pendants:
https://i21.servimg.com/u/f21/13/31/64/18/vervel19.jpg
No 68 - 71 are quite similar to mine. Description of No 68:
https://i21.servimg.com/u/f21/13/31/64/18/vervel18.jpg
Sadly it doesn´t give any clear information. But they might have had the same purpose.
Cheers
Andreas