| Great Britain - XX | 1929 (10 May). Airmails. Altrincham, Cheshire - Switzerland, Kalchofen. Multifkd env via Basel Airport (11 May). VF 4 1/2d rate. |
U$ | 50 |
| Great Britain - XX | 1929 (10 May). Airmails. Altrincham, Cheshire - Switzerland, Kalchofen. Multifkd env via Basel Airport (11 May). VF 4 1/2d rate. |
U$ | 50 |