Hi there I am the one in possession of this vase and it truly has been a puzzler. The comment about Henri Huppe got me started on a search using his name. Here is link to a vase that does look very similar to the one I have.. except much higher quality. So could there have a been a sort of school where artists could mold / make vases to learn the process and that's why there are so many different signatures? Like our modern day ceramic painting shops... many artists putting a spin on a mass mold.
http://www.icollector.com/ART-NOUVEAU-HENRY-HUPPE-19th-century-French-school-A-very-good-brown-patinated-bronze-figural_i763372