Amazing is all I can say!
I had found several Couffon lines in France but my issue was finding the link to who had a son named Achille that would have been the one that moved to St Pierre...and you found it! Thank you VERY much for the information!
I could find NO record anywhere in France for an Achille Couffon at all so the link between them was a total mystery to me LOL
Yes I do read french btw LOL I spent 17 years in Quebec growing up before leaving there for several other continents & cities :)
And the actual photos of the documents themselves is way more than I was ever hoping to find, I very much appreciate your searching on my behalf. My father will be so thrilled to see & hear all of this!