2540 Poland: 1915 Warsaw Local Post Mermaid 5gr unissued printing in green with "6 groszy" red opt applied as a trial. Mi I / 3aP cat €250+. Superb fresh MUH. Very rare as only 1 or 2 sheets of 40 printed. 2010 Ceremuga AIEP photo-cert. (P) $130 $200
2541 Poland: 1916 Warsaw Local Post surch set 2gr/10gr & 6gr/5gr, each both as INVERTED opt & INVERTED one DOUBLE opt!. Superb fresh MUH. Mi 9-10K & 9-10DK in footnote but unpriced. Scarce & spectacular. (4) (P) $130 $200
2542 Poland: 1916 Warsaw Local Post surch set 2gr/10gr & 6gr/5gr, each both as INVERTED opt & INVERTED one DOUBLE opt!, all in cnr blks of 4. F-VF fresh MUH. Mi 9-10K & 9-10DK in footnote but unpriced. Very rare in blks & spectacular. Exp Ceremuga AIEP. (16) (P) $550 $750
