Vase with no bottom ? ?

I would like to find out more about this vase. It has been made without a bottom. It is on a brass or bronze stand, I am fairly sure that this was made to go with the vase. It stands 16 inches high. It has three indistinct blue marks on the inside I have tried to shows these using a mirror .  Can anyone shed any light on what's the vase was for and on the decorations? Many thanks.