Hello,
Currently on ebay is a photo of a DFW C.V (Av) 200*/17
https://www.ebay.de/itm/316034843022...gAAOSwfXFnVWbV
The same seller has two photos of a DFW C.V (Av)from an earlier batch 187/17
https://www.ebay.de/itm/316034776863...4AAOSwGw5nVV3v
https://www.ebay.de/itm/365271426827...0AAOSwMCtnUred
If the dates givn on the photos are correct the above aircraft and those in the link below may be from the Flieger-Bomben-Lehr-Abteilung
https://www.ebay.de/sch/i.html?_dkr=..._nkw=frankfurt
Possibly the photographer subsequently served with a Riesenfluzeug unit?
https://www.ebay.de/sch/i.html?_dkr=...ugzeug&_sop=10
Regards,
Clint