The reference to Schwarze as breeder may be an error as the rose is called 'Schwarze Rose' (Black rose) in German. I presume bred before 1968 by Combe and introduced by Kordes.
The Combined Rose List says "introduced 1966"
Quote from Russian Botanichesky Sad Akademiiy, 1983: 'Schwarze Rose') (W. Kordes'Söhne, Sparrieshoop bei Elmshorn, Holstein, BRD, 1968)