The first pewter was born in 2003, the original sire was purchased in Canada from Regius Co in 2004. I highly doubt a pewter would be in Canada at that time for $2500. It was the previous owner's main Pastel breeder, nothing else popped out that looked anything like the odd female. We even bred him and nothing happened. It's either bad odds if he was a pewter or it's not him at all.
We just bred a Fire to the original female this year and again nothing odd came out. Again it's probably bad odds but this is my theory (it will sound far fetched but it's the fact that it's not impossible): All mutations are spontaneous, it's how they came to be in the first place. Could it very well be a spontaneous new line of cinnamon and or black pastel that was crossed with the pastel gene as it appeared which represents the odd female?