Since nobody else has replied about it, Jtw1313 asked me to comment. It appears to be a 1-piece cast pewter button with a cast-in brass wire loop. That type was manufactured in the very-late 1700s to mid-1800s. But I must mention, some "Fashion" clothing buttons are still being made that way today, using pot-metal which corrodes the same way pewter does. So, I can't say with CERTAINTY that your button isn't a modern-era one.
Your button has a "European-style" royal crown atop the main emblem. Even in your new, better photos I cannot make out the details inside the main emblem. But there seems to be the ends of two crossed rods or scepters showing around the edges of the main emblem. The only "near" matchup I can find, having the ends of crossed rods or scepters at the emblem's edges, is the Belgian coat-of-arms on the button and postage stamp in the photos below. But there doesn't seem to be a lion on your button's emblem.
Sorry, but the two paragraphs above are all I can tell you about your button.
