In this installment of Value Proposition, Donald Osborne sizes up a gorgeous 1964 Alfa Romeo Giulia TZ1, or “Tubolare Zagato.” Produced between 1963 and 1965 before being replaced by the TZ2, only 112 TZ1s were built, making these models one of the most collectible cars of their or any other era. You will want to check out this Alfa classic.