Lot of two 1912 Rhein/Main Airmail Flight covers –

1. June 17, 1912: Darmstadt (Sieger 12), white official postcard with the inscription "Sale of Official Postcards…", franked with a single 30pf green (Mi. III) and a 5fr Germania, tied by Darmstadt c.d.s. Very Fine.
2. June 16, 1912: 1m on 10pf "Gelber Huna" variety (Sieger 13c), used with 5pf single, both tied by individual strikes of "Flugpost am Rhein u am Main Darmstadt 19.6.12" large circular datestamp on a card bearing "Palais-Verwaltung Mainz."