Hello Richard,
Yes, it does look quite like the Halberstadt C.IX. Also checking my Grosz,Haddow, Schiemer I see that two were built, so a possibility that C.1113/18 was also the same type.
My concern with the ID as a Halberstadt C.IX would be that C.1114/18 preceeds by some distance any known Halberstadt C.V serial. Also would aircraft built specifically for A-H have German serials. Finally as far as I can tell the tail cross on the photo of the C.IX is in the late war style. See :
http://www.airwar.ru/image/idop/othe...8/halbc8-4.jpg
Still when all is said and done the ebay photo does look a lot more like a Halberstadt design than a Albatros.
Regards,
Clint