That is true when it comes to Chipco's, maybe.
Maybe: Quality control could very well catch some of them.
I believe the Seminole chips were made at Atlantic Standard possibly Bud Jones depending on the year issued. I am not sure of either ones production process.
BTW, I know at least 11 of the Seminoles exist, all the same.
That said:
"then the doubled other side exists in equal numbers."
Wouldn't the other doubled side chip be an exact copy of mine?
Let me think. Hmmmmmmmmmm
I am holding mine with the 25¢ facing me. Obverse is the $25.
I lay it down and pick it up $25 facing me. Obverse is the 25¢.
If I had two of them, then wouldn't I have both errors you are describing?