The reference I have does not say which model Singer was used, except to say that it was a 1952 model with a 1.5 liter engine. I believe that the only 1952 Singer models to use the 1.5 liter engine were the SM1500 sedan, and the 4AD Singer Roadster. Because the 4AD was exported to North America, I suspect that it would have been more readily available to two college boys from Southern California, so I will try the 4AD Singer Roadster.