Original Sparklets brand Carbon dioxide capsule/charger key, manufactured in the late 20's to early 30's, and designed to fit the Sparklets Type C glass bodied soda syphons (although this key will fit any Sparklets syphon from the 1920's through to the 1980's).  Produced in a light-weight die-cast zinc alloy and designed to fit the C (8 gram) sized CO2 capsule, which remains widely available to this day.  This has been carefully polished to a high shine.