Sorry, that should be Stumpf and not Stumpt like i spelled it before.
The company had many names so here are a few more words to google, in no particular order....
Cristallerie de Pantin
Stumpf, Touvier, Viollet & Cie
Monot et Cie
Monot
Stumpf & Cie
Monot Pere et Fils & Stumpf
Crystallerie de la Villette
It merged with Legras later on.