SFAIK ... Only the 500 has just one horn. His is a Corsa. Later, JR '61 Rampside Standard 4/110 '65 Monza Convertible 4/140 '66 beater Coupe - "icemobile" 4/140 - started life as a 500 (has 1 horn) bur has parts from Monza and Corsa scattered about