The Institute of Cardiology in Mexico was created in 1944 by Professor Ignacio Chavez and it has two large murals in the entrance hall that were painted by the eminent artist Diego Rivera. These murals illustrate the history of the heart and circulation and they have the portraits of many famous men. A portion of the mural appears on an 80 centavos airmail stamp and it has Einthoven as the central figure. The issue was limited to one million stamps. Diego Rivera was also the designer of this stamp, which was one of two that were issued on 8 …