Stamp: Industrial and Agricultural Workers Perf 11¾ x 11½ (Poland(Six Year Reconstruction Plan) Mi:PL 681C,Sg:PL 696c,Pol:PL 543a
Online Resources: All Things "Colnect" | The Stamp Forum (TSF)
Colnect, Connecting Collectors: 650,650 Stamps on Colnect
Colnect Collectors - Those Christmas stamps will surely enrich your collection! | Facebook
Francia: Nevers, 1962 : US$ 0,11 da tacito : Stamps Marketplace : Francobolli in vendita : Colnect
File:Stamp of Rajasthan - 1948 - Colnect 942692 - Stamps of Bundi overprinted.jpeg - Wikimedia Commons
File:Stamp of Finland - 1935 - Colnect 45855 - Kullervo setting out to combat.jpeg - Wikipedia
Francobolli: Official Stamps for Administration Post B (II and III) (Germania - Repubblica Democratica(Martello e compasso (tipografia)) Mi:DD DA22xIXII,Sn:DD O22a,Yt:DD S22,Sg:DD EO206,Un:DD SE22