Thank you Patricia for the suggestion.
I wish it was The Lion, a very rare rose that, according to HMF, can be found only in Sangerhausen. Unfortunatly I do not remember when and where I got the cutting, but hardly from that garden. My plant is still young so I do not know how the mature rose will become; at the present the number of flowers in the cluster look limited (5-9) and the shape of the inflorescence look more like that of a R. brunonii (corymbe) that like that of a R. multiflora (panicle). No scent to my nose.
A friend of mine suggested a similarity to Fairmont American Pillar ( http://www.heritagerosefoundation.org/cgi-bin/discus/discus.cgi?pg=next&topic=74&page=3944 ) but, also if they were the same, this fact does not help as also that rose is not identified, as far as I know.