Poland: 5 Marek Polskich 1917 Specimen with red overprint "Muster", 7-digit serial number A00000000 on back, title on front reads "Zarząd Generał-gubernatorstwa ..." and " ... Biletów Kasy Pożyczkowej ..." at left, P.11s, excellent condition with slightly wavy paper, traces of glue at left border on back. Condition: XF