Why cars made in 1967 has more value compare to other year model?

Assuming you are talking about classic American cars.



1967 was a good year. Most of the American manufacturers were building great cars in that time frame and 1967 was a peak year for style performance and quality.Why cars made in 1967 has more value compare to other year model?
Assuming similar condition, a 1965 Mustang is worth more than a 1967. I know of no exception. What car are you asking about?