52nd Auction - All World stamps & covers - Day 3

Russische Post in der Levante - Staatspost: 1907, 1 Pia on 10 K blue, single franking (uncancelled)
1907, 1 Pia on 10 K blue, single franking (uncancelled) on return receipt form, sent with violet cds from R.O.P.I.T / ANTHON, 3.APR.1907 (Mount Athos), to Tsarskoye Selo, St.Petersburg, obviously unclaimed, officially sealed with black label, and returned with cds from TSARSKOYE SELO S.P., 22.4.07, via transit ODESSA, 27.4.07 (cds in violet) to Mount Athos, kyrillic receiver cds R.O.P.I.T / ANTHON, 1.MAY.1907, alongside. F/VF condition.
Very unusual and scarce showpiece of Russian P.O. Levant Postal History!