Bulgaria
| Country: | Bulgaria |
| Type: | Postage stamps |
| Series: | Trees (1964) |
| Nominal: | 4 ст |
| Year: | 1964 |
| Size: | 40 x 46 mm |
| Perforation: | line 11½ |
Trees (1964)
 Walnut (500 Yrs.) 0.04$ |  Plane (1100 Yrs.) 0.1$ |  Plane (600 Yrs.) 0.15$ |  Poplar (800yrs.) |
 Quercus robustus |  Pinus nigra 0.65$ |