KALUGA: 1920, "P" bluish-violet handstamp overprint on 15 k., horizontal pair, neatly tied by cds. "KALUGA 16 5 22" to small piece, together with "P" on 10 k., used, very fine. Great postmaster provisional rarity, the pair illustrated in Geyfman, certificate Ceresa for both items (2014) (Geyfman 2, the 10 k. unrecorded)