Hello,
On 30.04.20 the following Brandenburg C.I photos are available on ebay:
Hansa-Brandenburg C.I (Ph) 29.57 Flik 16
https://www.ebay.de/itm/PHOTO-KuK-1W...oAAOSwz8teo0Ys
Hansa-Brandenburg C.I (U) 61.21 Flik 7
https://www.ebay.de/itm/PHOTO-KuK-1W...EAAOSwfZpeo03k
Hansa-Brandenburg C.I (U) 69.24 Flik 16
https://www.ebay.de/itm/PHOTO-KuK-1W...oAAOSw3TJeo-OG
Hansa-Brandenburg C.I (U) 369.??
https://www.ebay.de/itm/PHOTO-AK-KuK...MAAOSwvxBeo-vr
Regards,
Clint