These terms are not interchangeablIn simple terms Reproduction, Original, or Counterfeit are interchangeable.
I have absolutely no idea what your point is or indeed what Salsagev's point is. We do not appear to be speaking the same language or to be using the same definitions of words.OK, short story time.. Try replacing the word “original” with “fake” or reproduction in the following sentence and see how the emotion of the storyteller may change depending on the word used. Then see if the phrase that replaces ....... is the same in each case.
“I paid just over half a million dollars for my original Tompion longcase” said Mr Jones. And now I am going to ".........” the person who sold it to me.