Very good condition, bronze, diameter 60 mm. 100% original.

Prof. MUDr. Jan Janský (Czech pronunciation: [ˈjan ˈjanskiː]) (3 April 1873 in Prague – 8 September 1921 in Černošice, near Prague) was a Czech serologist, neurologist and psychiatrist. He is credited with the first classification of blood into the four types (A, B, AB, O) of the AB0 blood group system. Janský studied medicine at Charles University in Prague. From 1899, he worked in the Psychiatric Clinic in Prague. In 1914, he was named professor. During World War I Janský served two years as a doctor at the front until a heart attack disabled him. After the war he worked as a neuropsychiatrist in a military Hospital (Vojenská nemocnice). He had angina pectoralis and died of ischaemic heart disease. Janský was also a proponent of voluntary blood donations.