Hello,
Currently on ebay is a photo of Aviatik B.I (P 14) B.107/14 named Cassel at:
https://www.ebay.de/itm/WK1-Foto-Aub...sAAOSwIW1fGfQ~
This is an interesting find as I've not previously seen this serial on any published lists (unless anyone knows otherwise).
Regards,
Clint