1913, it is not just total mintage, it is also the population of a coin in it's grade. Consider the 1931-S. Fairly expensive right out of the gate, but does not really appreciate as the grade increases. There are a lot of high grade coins available and it holds the price down. The reverse happens more regularly. If yo study Morgans, there are many examples of a coin having very little value until it reaches a certain grade and then it goes through the roof, showing a lack of a high grade population for that coin.
I personally keep every wheat from 1932 back and any coin in a higher grade.
Jim