I learned alot about the industry and how collectors look at things through this discussion. Thanks for sharing.
May I suggest that the 80s be called "pre-modern", or just "The 80s", and anything post-1989 be considered "modern". 89 UD, 92 Bowman, 93 refractors, it is all pretty close to 1990. Maybe 1974-1980 is "post-vintage", or maybe even better "post-post-war", or "post-war-squared"
It's fun just reading about this!!