there are different kinds of pontil marks, some starting around the Civil War era and extending to today.
Is there a seam around the lip where it meets the orange peel-ish shoulder?
If it looks symmetrical it's very new, if it looks like someone slapped a top/spout on it, it could be an early bottle.
I put the 2 pics on the Bottle forum I'm on. Someone on there will know what it is or isn't.