Switzerland
Black overprint on 1932 MiNr. CH 257
| Country: | Switzerland |
| Type: | Postage stamps |
| Series: | Airmail |
| Nominal: | 40 Ct. |
| Year: | 1937 |
| Size: | 36 x 22 mm |
| Perforation: | comb 11½ |
| Mintage: | 2,725,000 |
