Curiosity always wins out. What is for sure is that your 4 bore was finished/constructed/contracted by Edmond Lefaure about 1869, located at passage Jauffroy, 20, Paris. The date on the barrels coincides with Edmond's becoming sole proprietor of the firm, meshes with his change of the font on the barrels per the 1867 advertisement and confirmed by other similar guns with the "Ed. Lefaure" imprint. (And this study probably is unique to the internet; Lefaure should have a more complete history).
Edmond Alexis Marie Lefaure - Proprietor 1867 - 1872: Around 1867, Louis retired and his business was taken over by
Edmond Alexis Marie Lefaure. At this time Edmond adopted the script seen on 12BM’s gun. Edmond had already been working with his father for 26 years and may have retired in 1872 and the firm disbanded although research has not been done to confirm this.
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