Just as the topic says i am just interested in what the vote would be.
My own opinion is 2020, even though i know the 240Z was first released in Japan in October 1969, but only a few cars made it to the USA that year, here we didn't see any 240Z's until 1970, and all but 1 subsequent anniversary cars that have been released by Datsun/Nissan have celebrated as if the original release was in 1970
1980 10th anniversary 280ZX
1984 15th anniversary 300ZX Z31
1995 25th anniversary 300ZX Z32
2005 35th anniversary 350Z
2010 40th anniversary 370Z