Germany, Paul Ehrlich and Sahatchiro Hata, the Conquest of Syphilis, c. 1910, a bronze medal by J. Kowarzik, Ehrlich and Hata poring over a test-tube, rev. naked male wrestles with multi-headed monster, 66mm (cf. DNW 64, 1427). Extremely fine, rare (£80-100)

Dr Paul Ehrlich (1854-1915), from Strehlen, Upper Silesia (now renamed Ehrlichstadt in his honour), shared the Nobel Prize in 1908. One of the main founders of chemotherapy, he worked with Sahatchiro Hata (1873-1938) to develop a cure for syphilis in the first decade of the 20th century