Zalencentrum de Swan, Middenweg 178, Heerhugowaard                                        www.deswan.nl      
      Koninklijke Nederlandse Bond van Filatelisten                                                             www.knbf.nl                                    

      Postzegelveiling Corinphila  in Amstelveen                                                                   www.corinphila.nl                                 
      Maandblad Filatelie                                                                                                           www.defilatelie.nl                                
      Postzegelveiling de Hollandse in Alkmaar                                                                     www.de-hollandse.nl                       

      Postzegelvereniging Castricum                                                                                       www.pvcastricum.nl                           

      Postzegelvereniging Purmerend                                                                                     www.pprc.nl

      De Poststempel verzamelaar                                                                                           www.poststempleverzamelaar.jouwweb.nl       

      Postzegelvereniging Statuut 80                                                                                       www.statuut80.nl

      Postzegelclub Hoorn                                                                                                         www.depostzegelclubhoorn.jouwweb.nl

      Website voor het ruilen van postzegels                                                                         www.stamptrade.nl