1963 Pininfarina Spider Convertable

Hello All:

I am a newbie to this forum. I was currently offered to purchase a 1963 Pinanfarina, Cabriolet 1600. It is a one owner car imported specifically for the origanal owener so many years ago. Overall the car is in good condition. Costmetically, it is very well. Engine, I think may need a tune up and so forth and then there is front suspension and steering to get worked on but he car starts and runs well. It has soft and hard top. I have the following questions:

1) What is a fair market price for this car?
2) How rare is it? I can not find much on the internet.
3) How are its pits and falls?
4) Are parts still easy to come by?
5) And any other information that you can give me about this car?

Thanks

Iggy