France, 25th Anniversary of Dr Roux as Director of the Institute Pasteur, 1913, a silver medal by V. Peter, bust left, reverse legend in wreath, 65mm (BDM –). Light surface marks on obverse, otherwise very fine, rare (£60-80)

Dr Pierre Paul Emile Roux (1853-1933), physician and bacteriologist, who contributed to an early understanding of diphtheria and, before joining the Institut Pasteur, studied chromosome make-up