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.
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.
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.
The term "Seated Liberty Dollar" refers to silver dollars produced in the United States between 1840 and 1873. The coins have and image on the obverse (front) of a woman representing Liberty seated, facing left (although with her body facing right), with a shield in front of her. Note that "Gobrecht Dollar", dated either 1836 or 1839, has a very similar obverse but a different eagle on the revese (back) - it is generally considered to be a pattern coin. Note that the Trade Dollar, produced between 1873 and 1878 (with proofs made until 1885) for trade in the Far East, also has a seated depiction of Liberty, but the image of the woman is different (she is, amongst other things, holding a branch in front of her), and the reverse has the words "TRADE DOLLAR". Finally, note that the Liberty Seated device also appeared on the half dime, dime, quarter and half dollar during much of the Liberty Seated Silver Dollar's time of circulation.
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.