Montre maintenant: Suisse - OIT (1930 - 1939) - 8 Timbres-poste.
1938
International Labour Organization - Switzerland Postage Stamps of 1938 Overprinted "S.d.N - Bureau - international - du Travail"
2. mai WM: Aucun Perforation: 11¾
1938
International Labour Organization - Switzerland Postage Stamps of 1938 Overprinted "SERVICE DU BUREAU INTERNATIONAL DU TRAVAIL"
septembre WM: Aucun Perforation: 11¾