BELGIUM (1988) Lyre. Quill pen. Book. Atomic symbols. Ministerial proof. Scott No 1296, Yvert No 2297. Royal Academy of Science, Literature and Fine Arts.
AVAILABLE AT $50
AUSTRIA (2016) High Energy Physics Institute 50th anniversary. Black print.
AVAILABLE AT $15
HUNGARY (1974) Janos Segner*. Segner wheel*. Photographic proof. Scott No 2312.
AVAILABLE AT $40
AUSTRIA (1992) Paul Kitaibel*. Black proof. Famous botanist. Scott No 1562, Yvert No 1885.
AVAILABLE AT $15
AUSTRIA (1999) Draftsman's tools*. Books*. Black proof. Austrian patent office. Scott No 1781.
AVAILABLE AT $15
AUSTRIA (2015) Joseph Hardtmuth*. Black print. First mass-produced cheap pencils.
AVAILABLE AT $15
AUSTRIA (1977) Nicholas Joseph von Jacquin*. Black proof. Botanist who first brought platinum and sugar cane to Austria and did seminal work on tropical fungi. Scott No 1051, Yvert No 1369.
AVAILABLE AT $20
U.S.A. (1946) Smithsonian Institution*. Photo essay of final design commemorating centenary of founding. Scott No 943, Yvert No 495. Rare!
AVAILABLE AT $60
AUSTRIA (1967) Vienna*. Black print. Scott No 794, Yvert No 1075. 10th Europa talks "Science & Society in Europe."
AVAILABLE AT $20
AUSTRIA (1981) Johann Florian Heller*. Black print. Scott No 1183, Yvert No 1505. Pioneer of urinalysis. 11th International Clinical Chemistry Congress.
AVAILABLE AT $20
AUSTRIA (1983) Karl von Terzaghi*. Black print. Scott No 1255, Yvert No 1582. Founder of Scientific Subterranean engineering and the father of soil mechanics.
AVAILABLE AT $20