Beautiful and highly sought after soda water bottle with something just a little unusual.  Soft  green in daylight, fluorescent green under ultra violet light. 
this is created by the addition of uranium oxide to the glass, it is perfectly safe in the home. 
Siphons were used at home or in bars to carbonate fresh water. As vintage items they are sold as beautiful decorative, non functioning objects. 
The bottle has two little chips, they are not sharp or deep and aging to the metal top. Overall,  it is in good vintage condition, it stands 31cm, 12.5" approximately. 

French antique uranium glass etched seltzer siphon bottle