1922, 45 P. Airmail issue (4) in mixed franking with others values on cover from "Moscow 25.11.22" to Berlin with arrival stamp 1.12.22, in winter found only test flights as a trial measure the flight conditions in lieu of, whether as well post was transported is not locking cleared, the airmail transportation as well the red postmarks "with airmail transported Königsberg (Pr. ) 1. " can unconfirmed become. Judgment Hovest VP (2020)