| Ref No | Year | Description | Type | U.M. | F.U. | FDC |
|---|---|---|---|---|---|---|
| S91-1 | 1991 | National Monuments | 8 v | 12.00 | 12.00 | 14.00 |
| S91-2 | 1991 | Singapore '95 Orchids Series I | Se-tenant pair with gutter |
8.00 | 7.00 | 8.00 |
| S91-2M | 1991 | Singapore '95 Orchids Series I | MS | 12.00 | 12.00 | 12.00 |
| S91-3 | 1991 | History of Civil Aviation | 4 v | 8.00 | 7.00 | 8.50 |
| S91-4 | 1991 | Orchids | 3 v | 4.00 | 4.00 | 5.00 |
| S91-5 | 1991 | Garden Birds | 4 v | 6.00 | 6.00 | 6.00 |
| S91-6 | 1991 | Productivity Movement | 2 v | 2.00 | 1.60 | 2.50 |
| S91-7 | 1991 | Philanippon-Singapore Flora | 4 v | 8.00 | 6.00 | 8.00 |
| S91-7 | 1991 | Philanippon-Singapore Flora FDC with Japan "B31" postmark |
4 v | - | - | 10.00 |
| S91-7M | 1991 | Philanippon-Singapore Flora | MS | 8.50 | 8.50 | 9.00 |
| S91-7M | 1991 | Philanippon-Singapore Flora FDC with Japan "B31" postmark |
MS | - | - | 11.00 |