Lambert's listing of Druschki rubra in the section on Hybrid Perpetuals:

Druschki rubra (P. Lambert 1929) strong growth, upright, bushy, dark green leaves, healthy. Bud pointed, most beautiful when half open, petals wide and reflexed, open blooms not fully double, intense dark red, exceptional fragrance. For cutting only in bud form. Also good as a garden rose (Frau K. Druschki x Luise Lilia)

Source: Peter Lambert, "Rosen, Obst und Zierbäume", Trier 1938/39