CARLSRUHE, 10 Pfg on 20 Pfg overprint Type III a provisional issue 1920, 25 Pfg dark brown horizontal pair, Steelworks and Dove of Peace 1920 on registered letter addressed to Schloss Matzenau, Post Prosenjakovci pri Murska Sobota Prekomurje / Yugoslavia (SHS State). Recipient Karl Graf von Matzenau (1851-1932) was a prominent philatelist and creator of his own local overprint issue. Double-circle CARLSRUHE 17 4 20 * (SCHLES) * (OS handbook No. 042.1). As sender gave both SHS State and Hungary as destination country, letter attracted several censorship offices and was repeatedly opened and resealed. German Empire: Dresden currency control grey resealing strip / control label similar to OS handbook No. III A, but without code "4", double-circle DRESDEN 20.4.20 ALTST. 7 l transit (OS handbook No. III Bb 2) and single-circle "4" (red) and "81" (violet) handstamps, both unlisted in OS handbook. Hungary: violet single-line Z1 Cens (ura) Szombathely (listed in K.-K. Wolter's reference "Die Postzensur I"), white resealing label for mail found open (Van-pecsetjegy) and double-circle BUDAPEST 929-APR 28 K 70 K, postal cancels partly smudged, nevertheless an unusually informative postal-history cover