First day cover and 5 schilling stamp featuring Dr Erwin Schrodinger 1887-1961 on the occasion of a special exhibition in the Zentralbibliothek fur Physik in Wien, Vienna, Austria, franked 11 August 1987
First day cover and 5 schilling stamp featuring Dr Erwin Schrodinger 1887-1961 on the occasion of a special exhibition in the Zentralbibliothek fur Physik in Wien, Vienna, Austria, franked 11 August 1987