Here is a slightly different parentage:

"GRUSS AN FREUNDORF. F. Praskac, 1913. The rose which I have grown under this name is a vigorous Multiflora bearing huge clusters of deep velvety maroon-red flowers. Its parentage is reported to be Wichuraiana Rubra X Crimson Rambler, and it is described as a creeper, which the rose I know is not; but true to name or not, it is a superb variety of its type."

Source: "Climbing Roses", G.A. Stevens, New York 1933