This "Sir Humphry Davey Safety Lamp" is solid brass, has a full unused wick and is ready to use.  No missing parts.  
 
This lamp is in great condition and with a bit of brasso and elbow grease will come up gleaming (if that's how you want it to look, but some prefer them to look a little tarnished so I have left it unpolished).

The total height from hanging from it's hook is 12" (30.5cm), or standing it measures 9" (22.8cm).
The diameter of the base measures 3.1" (8cm)

This is a great opportunity to acquire what I believe is quite a rare lamp and an interesting example of "Pit Memorabilia".