Hello blake77, first of all, welcome to The Glass Mesage board. I see you are in USA.
Nice to see such clear pictures and a good sized photo of the acid etched mark.
I have spent quite a time looking through Google since you posted this thread, as I am sure you have, and so far, like you, am stumped! Most are in French and won't respond to Translation requests
I have tried the Glassmark Lexicon, but even with my albeit limited knowledge of French, I am unable to find this mark.
Perhaps Ivo will find a little time to come back with a helpful link so that we can continue more productively with the search??