10 Rbl. On 1 Rouble postal stamp, overprint in type III, variety \"inverted overprint\", cancelled by mute two ring cancel \"12 5 42\" and one-line cancel \"Alexanderstadt\" on piece, the edition of the stamp is anyhow already little - examples with inverted overprint belong to the largest rarities of the German occupation issues in the II. World war, photo expertize Walter Zirath BPP (2023)