Poland
| Country: | Poland |
| Type: | Postage stamps |
| Series: | 4th Int. Congress of Military Medicine, Warsaw |
| Nominal: | 25 gr |
| Year: | 1927 |
| Material: | white thin smooth |
| Perforation: | comb 11¾ x 11½ |
| Mintage: | 975,000 |
4th Int. Congress of Military Medicine, Warsaw
 Dr. Karol Kaczkowski (1797-1867) 0.93$ |  Dr. Karol Kaczkowski (1797-1867) |  Dr. Karol Kaczkowski (1797-1867) 0.98$ |