Sheets of Hong Kong, 1991 all added
| Issuer | Date | Desc | State | ||
| - |  |
Hong Kong | 1/24/1991 | Year of the Ram 1991, sheet of 4 types | all added |
| - | no image | Hong Kong | 8/25/1991 | 150th Anniversary of Hong Kong Post Office, sheet of 1 type | all added |
| - |  |
Hong Kong | 11/16/1991 | PHILANIPPON 1991, sheet of 1 type | all added |
| - |  |
Hong Kong | 12/4/1991 | sheet of 1 type | all added |