* Total Production Numbers: The exact number of 1964 Park Lane convertibles produced isn't readily available in a centralized, easily accessible database. Finding this information would likely require extensive research through Mercury historical records (if they exist and are accessible) or contacting specialized classic car databases.
* Surviving Examples: Even if the original production numbers were known, many cars are lost to time due to accidents, scrapping, or deterioration. The number of surviving, restorable, and currently-registered cars is a much smaller, and harder-to-determine, figure.
* Condition: A perfectly restored, concours-condition 1964 Park Lane convertible would be far rarer than a heavily modified or unrestored example.
In summary: While it's safe to say that a 1964 Mercury Park Lane convertible is a relatively rare car due to being a large, luxury model with a convertible body style – precisely *how* rare is difficult to quantify without extensive archival research. You'd be dealing with a low-production number car, making it significantly rarer than many other vehicles from that year.
