Switzerland
1913, 50c Schweizerische Nationale Flugspende Herisau Aviation Meet
semi-official airmail, unmounted mint, a bright and fresh example, well-centered and choice, very fine. (SBK V)
Switzerland Zumstein SBK V **
$ 266.50
Switzerland
1913, 50c Schweizerische Nationale Flugspende Herisau Aviation Meet
semi-official airmail, unmounted mint, a bright and fresh example, well-centered and choice, very fine. (SBK V)