Note that the index numbers are only technical numbers which have no persistence. After a new system generation is done, all of them are invalid. To generate a persistent link, use the name.Use the URL:
http://ww-person.com/cgi-bin/l3/LANG=germ/F=Friedrich@Victor@Ludwig@Carl@Cecil/N=v.Reventlow-Criminil
Friedrich Victor Ludwig Carl Cecil v.Reventlow-Criminil
alternatively: /cgi-bin/llmult/LANG=germ/P=62007221