Shade is in pretty good condition, though it has one very slight chip on the bottom rim. All of them are in about the same condition. I did not try to clean this to remove any marks from storage/shelf wear. Bottom opening is 5" with widest part at about 6". Depth/height is 5" on this one. 

These are part of a large gas lamp collection that I will be selling in the coming months, so keep watching the auctions.