I have 7 of these type coins mine has a weight of 27.7 G, 44mm in diameter , and is magnetic. I was told they were given away or sold at Las Vegas casinos in the years when the slot machines took silver dollars that is why they are much larger than silver dollars. I have several varieties of actual U.S. mint coins a 1921 Peace & Morgan , an 1879 Trade Dollar, a 1795 Draped Bust Dollar, and an 1878 & 1872 Seated Liberty Dollars. If they were not so oversized you would swear they were real. I know this is an old thread but pleas feel free to place the history of these coins. The 1851 Indian Head one is the only non authentic copy I have.