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Yes but you probably won't get much for it. Generally Roman coins go for $50 to $100 USD. A coin specialist can tell you specifics.
Nope, sorry.
The date on the coin will tell what year it was made.
I think you would have to be a physicist to do that. It would be easier to identify the coin by nation of origin, date and denomination, and a coin guide book will help do this, and the book will tell you what metal the coin is made from.
If the coin is made from gold, it will say so on the packaging it was sold in.
Assuming you refer to the 1981 British 25 Pence coin (Crown), it is made from a copper-nickel alloy. If you have a sterling silver Proof coin, it will state somewhere on the packaging that the coin is made from sterling silver.
By looking at the coin. Modern coins made for circulation have the mintmarks on the front. P= Philadelphia. D=Denver.
By the mint mark on the reverse of the coin, but silver dollar coins with no mint mark are made in Philadelphia
Typically US coins with no mintmarks were made in Philadelphia.
Since anyone can make a copy coin, it is impossible to tell what metal the coin is made out of without seeing the coin in hand. In general, they are made out of base metals (gold plated copper or something like that) but a jeweler might be able to tell you for sure.
If it is a "Silver" coin, it will say so on the case it came in.
Could you tell us a bit more about this coin? I won't say for certain that no coins designed by Morgan were made in 1929, but the dollar coin that is named for him was not minted after 1921.