hello Michelle - welcome to the GMB

We would need to see a picture, or two, of your glass - there are many variations and makers of comports, and as far as I know Davidson's lion trade mark from the late C19, doesn't have a crown.
Values for glass are not something that are provided on the GMB - again too variable, and mostly a personal matter, just something we tend not to discuss.
However, if we can provide an identification of your glass, you might then look at ebay or other auction sites and possibly find similar pieces to see quoted values.
