Here is the same button someone posted in "What Is It" thread ...
http://www.treasurenet.com/forums/what/388465-button-old-home-site-how-old.html#post3716255
CannonBallGuy one of TreasureNets experts on projectiles and buttons said the following: The United Kingdom Detector Finds Database shows your "conical" 1-piece brass button (and info about it) here:
UK Database finds:
The UKDFD says it dates from the mid-1600s to mid-1800s. In my opinion, it doesn't date back to the 1600s, because the brass wire loop is soldered/brazed onto the button's back. I haven't seen any other 1600s buttons with that form of loop attachment. I've read in several books on Historical buttons that "early" button-makers had serious trouble getting a soldered/brazed loop to stay LONG-LASTINGLY attached, a problem which wasn't reliably solved until the second half of the 1700s. But perhaps there is proof somewhere that such buttons from the 1600s do exist. If so, I hope somebody here will post the proof (with details), so we can all learn about it. Meanwhile, until I see the rock-solid proof, my opinion is that your button dates from the latter-1700s through the early-1800s. The fact that it is a dug one whose loop is still quite firmly attached indicates it was made after the soldered/brazed loop attachment problem was reliably solved.
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I also stated on that thread this button style was worn a-lot during the 1820s-1830s (andrew jackson era)