| 2021 | Lars Engelbrecht RDP Denmark for Postal Stationery of Denmark – The Bi-Coloured Issue 1871-1905 (2 vols) |  |  |
| 2021 | Pedro Vaz Pereira Portugal for Os Correios Portugueses 1853-1900 / The Portuguese Post 1853-1900 (2 vols) |  |  |
| 2020 | Miroslav Bachraty Slovakia for Slovensko 1938-1945 / Poštová história (2 vols) |  |  |
| 2019 | Henrik Mouritsen RDP Denmark for Danish Postal History 1875-1907 |  |  |
| 2018 | Károly Szücs Hungary for Fiscal Philately of Hungary |  |  |
| 2017 | Brian Trotter RDP United Kingdom for Southern African Mails, Routes, Rates and Regulations 1806-1916 |  |  |
| 2016 | Ari Muhonen (chief researcher) Finland for Finnish postage rates 1875-2001 The co-authors of this research: Harri Ala-Honkola, Hannu Kauppi, Juhani Kerppola, and Esko Seitsonen will receive a Certificate. |  |  |
| 2015 | Michèle Chauvet RDP France for Les tarifs helléniques des lettres internationales 1861-1878 |  |  |
| 2014 | Frank Walton RDP United Kingdom for The La Rue Collection, vol. 1 to 6 |  |  |
| 2013 | Stephano Calliga Greece for The Stamps of the Large Hermes Heads 1861-1886 |  |  |
| 2012 | Luis Virgilio De Brito Pereira Frasâo Portugal for Pre- Filatelia Portuguesa. Marcas postais utilizados em Portugal continental na época pré-adesiva (1799/1853) |  |  |
| 2011 | Wolfgang Maassen RDP Germany for From the First Albums and Catalogues to Publishing Houses of Global Standing |  |  |
| 2010 | Patrick Maselis RDP (editor and co-author) Belgium for Catalogue of MonacoPhil 2009 The co-authors of this research: Messrs Stes, Delbeke, Schouberects, Tavano, Huys, Kaiser, Van Pamel and Slabbinck will receive a Diploma. |  |  |
| 2009 | Nino Aquila and Francesco Orlando Italy for Sicilia – I timbri del Nuovo Re [Sicily – the postmarks of the new King] |  |  |
| 2008 | Mario Mentaschi and Thomas Mathà Italy for Letter Mail from and to the Old Italian States 1850-1870 |  |  |
| 2007 | Michèle Chauvet RDP and Jean François Brun RDP France for Introduction à l’histoire postale de 1848 à 1878 |  |  |
| 2006 | Bruno Crevato-Selvaggi RDP Italy for Il Regno d’Italia |  |  |
| 2005 | Patric Maselis RDP Belgium for From the Azores to New Zealand | |  |
