Any US coin made for general circulation that does not have a mintmark was struck in Philadelphia.
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Peace dollars were made from 1921 to 1935. An 1879 silver dollar is called a Morgan dollar after its designer George T. Morgan. There's more information at the Related Question
A U.S. silver dollar dated 1879 is a Morgan dollar. Assuming it is circulated and does not have a mintmark, values run from $25.00 to $40.00 depending on the condition of the coin.
The first silver eagle was made in 1986 not 1879. It's called a MORGAN dollar after the designer George T. Morgan and assuming it's circulated and has no mintmarks, retail value is $17.00-$26.00 the date is very common.
It is made of 90% silver and 10% copper.
It's a Trade Dollar not a Morgan dollar. If you look at the back of the coin, the phrase "Trade Dollar" is under the eagle. As to value, take it to a coin dealer for an assessment it may not be genuine. The entire series is known to have had copy's and fakes made.