| Nova Imprim, Chișinău, Moldova |
|
| o |
|
| O & M Printwize |
|
| Oberly and Newell Co. |
|
| Oceania Beauro of Printing |
|
| Officina Calcografica Italiana, Roma |
|
| Officina carte valori - Torino |
|
| Officina Carte Valori Torino |
|
| Officine Carte Valori Torino |
|
| Offset |
|
| Oficina Carte Valori Torino |
|
| Oficina Impresora de la Secretaría de Hacienda |
|
| Ohlenrothsche Druckerei |
|
| OPTYS Printing house |
|
| Oriental Press, Bahrain |
|
| Österreichische Staatsdruckerei (Austrian State Printer) |
|
| Österreichische Staatsdruckerei GmbH |
|
| P.J. Stevenson |
|
| P.T.T. Bern (Swiss Government Printers) |
|
| Paicheng Printing Press |
|