Bulgaria
| Country: | Bulgaria |
| Type: | Postage stamps |
| Series: | Trees (1964) |
| Nominal: | 10 ст |
| Year: | 1964 |
| Perforation: | line 11½ |
| Mintage: | 300,000 |
Trees (1964)
 Walnut 0.04$ |  Plane 0.1$ |  Plane 0.15$ |  Poplar |
 Quercus robustus |  Pinus nigra 0.65$ |