Fiat and Alfa Romeo both introduced new roadsters in 1966.  In that year, the Alfa Romeo 1600 Spider Duetto  was introduced at the Geneva auto show.  Fiat introduced their 124  Spider at the Turin auto show.  Alfa brought the Duetto into production that same year; while Fiat officially registers 1967 as the first production year of the 124 Spider.

Both cars were designed and built - virtually side by side - by the Pininfarina studio.  The bodies were then shipped to the respective manufacturer for mechanical assembly.  The  mechanicals chosen for both cars were revolutionary for the times - disc brakes, twin overhead cam (the Alfa is chain driven, the Fiat is belt driven) engines, five speed transmissions, and exceptional suspension systems. 

As a past and present owner of these cars, I hope you find them as delightful as I do.  Click on the picture of the Fiat Spider for the Fiat section.