Travis what you say should be correct, but it's not.
Don't know how long you have been collecting.
I have been at it about 25 years now.
Anything that has been reproduced in the last 10 years has driven down the price on the orginals built in the 60s and 70s.
Example: I bought a Farmall 560 built in the 60's in about 1992 for $175 in good condition.
I can buy all the 1962 built 560s I want today for 90 to 125 dollars.
People are buying the reproductions for less money and no one wants the orginals any longer.
Maybe the orginals will go back up but they aren't yet.