Switzerland
overprinted with small black control numbers (2.5 mm high)
| Country: | Switzerland |
| Type: | Postage stamps |
| Series: | Franchise Stamp |
| Nominal: | 20 Ct. |
| Year: | 1921 |
| Material: | granite, blue green |
| Size: | 20.5 x 24.5 mm |
| Perforation: | comb 11¾ |
