My Tires Were How Old?

Thanks to an excellent post http://www.alfabb.com/bb/forums/spider-1966-up/196648-my-tires-ancient.html on the Alfa Romeo bulletin board I looked into my tires' age.  They were Pirelli P400s that looked perfect.  Hardly any tread wear and no blemishes anywhere.  Since the 90's US tires had to have a date code added to each tire made.  These had no date code.

Took the car into my local tire shop and sure enough, the tires were pre-1990.  At least 22 years old.  New tires all around and a front end alignment were in order.  Went for a quick drive after that and those new Goodyear tires sure make a difference in Gina's handling!