Auction Series 257-264 in Zurich Day 2

1882/85: 50 st. deep blue on rose-pink, a single example used on 1889 imprinted cover "L'Intendance / de la Liste Civile / DE S.A.R. LE PRINCE / DE BULGARIE" to Vienna tied by single ring PALAIS / SOPHIA datestamp in blue (Nov 2) with registration cachet at left. Large black royal wax seal on reverse alongside "Bur. Ambul. / Harmanly-Izaribrood" Travelling Post Office cds and Vienna arrival cds. A charming and scarce cover.
Catalogue 260: Italy, France and European Countries