The one in L'Haÿ-les-Roses is (most probably) Cibles.
The references say "quite full" in 1907 and "single flowered" in 1910, and even though it is not the closest to variety release date, I would somehow trust more the 1910 reference of a single flowered variety for it comes from the brother of the breeder himself, hence, I would believe, quite well placed to know the true one.
On the other hand, if damascena was used as the pollen parent, it is quite surprising that it would create a single flowered clone, but maybe that's why Paul selected it....
Did anyone see the plant in Sangerhausen bloom and could give insight on wether it is the true one or a doubtful one?
Thanks!