Oh dear - I wonder how the signature has been added, it looks quite messy? I've seen a lot of Schlevogt/ Desna items with sandblasted Lalique marks before, as well as a fake moulded mark on a Consolidated glass plate which had been built up out of some kind of resin. Never seen a Lalique mark on a Libochovice item before though...
Here's another piece of 'Lalique' I spotted recently:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=400088377550 the idiot who dremelled this once beautiful Jobling Jardiniere has even managed to spell 'France' incorrectly.....