COSTA RICA (1954) Pharmaceuticals*. Imperforate proof pair in unissued colors. Scott No C240, Yvert No PA238.
AVAILABLE AT $30
PERU (2004) Cat's Claw (Uncaria tomentosa)*. Imperforate pair. Medicinal plant used as a treatment in a wide range of immune system conditions. Scott No 1416. Only 2 proof sheets exist!
AVAILABLE AT $160
PERU (2004) Camu-camu (Myrciaria dubia)*. Imperforate pair Medicinal plant with one of the richest concentrations of vitamin C in the fruit. Scott No 1417. Only 2 proof sheets exist, and only 1 was signed in the margin!
AVAILABLE AT $160
PERU (2004) Maca root (Lepidium meyenii)*. Imperforate pair. Medicinal plant used to treat male impotence and female menopausal symptoms. Scott No 1418. Only 2 proof sheets exist!
AVAILABLE AT $160
AUSTRIA (1972) Otto Loewi*. Black print. Scott No 942, Yvert No 1243. Won Nobel Prize for study of chemical transmission of nerve impulses.
AVAILABLE AT $20
AUSTRIA (1981) Scale*. Black print. Scott No 1185, Yvert No 1507. International Pharmaceutical Federation World Congress.
AVAILABLE AT $20