20 Pfennig Rhine-Main airmail together with 5 Pfennig Germania on official airmail card with special "Frankfurt (MAIN) 14.6.12" cancel, airmail stamp MiNr. II shows plate flaw III: "white dot at bottom of curve of P in Pf, position 18", postally used to Berlin, very good condition, slight adhesion trace at bottom of card, Mi. 250.-