KASSIMOV (RYAZAN): 1921, "250" violet handstamp overprint on 5r. and 7 r., horizontal pair, the later with cds. "KASSIMOV 7 2 23", very fine, mentioned in Geyfman as questionable, sign. and certificate Ceresa (2014) (Geyfman 1, the 5 r. unrecorded)
