Two complete sets of 10 German poster stamps (reklamemarken) designed by Otto Ludwig Naegele (with Czech and U.S. company trader imprints)

Complete set of 10 with Czech company trader imprints
Alois Fröhlich from Prague.
(unusual considering the stamps are German)

Complete set of 10 with U.S. company trader imprints
Recano's Novelties Co. from Great Falls, Montana. 
(most unusual considering the stamps are German)