Not a real one. There are silver rounds with the seated liberty design that would be about 25% larger than an original. There are also "coins" the size of coasters made of base metals, but I have not seen a seated dollar in this set. And, when William J. Bryan was running for president, a rival had double-sized silver coins made to show what would happen to the monetary system if he were elected, but that would probably have been a Morgan Dollar.
If you have a Seated Liberty dollar dated 1875, then you have a counterfeit -- the last year for them was 1873
The Liberty Seated dollar has the same diameter as Trade, Morgan & Peace dollars, it's 38.1mm. The thickness is 2.4mm.
Aside from the minor differences in design, the greatest difference between the US Trade Dollar and the Seated Liberty Dollar is the weight. The Liberty Seated Dollar weighs 26.73 grams while the US Trade Dollar weighs 27.22 grams. Both contained 90% silver and 10% copper altthough the Trade Dollar had slightly more silver in it. The Trade Dollar was issued primarily for circulation in the Orient while the Seated Liberty Dollar was issued for circulation in the USA.
It is a counterfeit.
The weight of the 1847 Liberty Seated dollar is 26.73 grams.
The 1847 Liberty Seated Dollar reverse is not the same as a Trade Dollar dated 1874. The eagles face different directions, Liberty Seated is left and the Trade Dollar is right. Also on the obverse of the Liberty Seated coin the body is facing right with head left and with the Trade Dollar the body and head are both facing left. The only way a 1847 dollar would have the reverse of a 1874 Trade Dollar is if it's counterfeit. I suggest showing it to a collector or dealer for their opinion.
This is a Liberty Seated Dollar and circulated coins are valued at $300.00 to $1,000.00 depending on condition.
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The 1851 Liberty Seated Dollar is valued from $10,000.00 to $45,000.00
I have NO idea what a "donnla" is. If you mean "dollar", the first coins to use the Seated Liberty design appeared in the 1830s.
One of the easiest and most accurate ways to determine the authenticity is to weigh it. A genuine Seated Liberty silver dollar should weigh 26.73 grams.
Although "Miss Liberty" is seated the coin is not a Liberty Seated dollar (1840-1873), it's a 1877 TRADE DOLLAR (1873-1885) as stated on the reverse. Authentic circulated examples have retail values of $120.00- $350.00. NOTE: The entire series of these coins is known to have replicas, copy's & counterfeits.