maybe the last 25-30 years Chris..
but you know what, 90% of what sells today in the hobby was considered detritus back then and alot of what is considered detritus now was considered top notch then..
And that's how it works...I remember when 1920's & 30's westerns and Shirley Temple were all the rage...well they seem to have an anemic quality lately...Some Tarzan posters have dipped lately too..In November 2011 I never saw so many mediocre results for Laurel and Hardy material..
Stooges material is way up (6 scene cards at heritage this July went for $8,900 each!!) and its nice to see some Jumbo Lobby Cards (Dr. Jekyll specifically) doing well...which personally I think are way undervalued for what they are!!