That is known as a "Scroll Flask" and the feature on the bottom is called an "Iron Pontil". I don't know much about them, but it appears legit (versus a Clevenger Bros repro) so it's probably from the 1850s or so. Nice piece.
Type selling in the search find the selling thread not sure what it is called then click on it. Scroll down a bit and look for little orange box says post thread on left of page follow instructions from there