The $1 denomination is artificial. You have a bullion piece sold for its silver content; the current price is about $18/oz.
If you go to a Mint website, you will find the difference between Genuin & Replica. If your coin is Genuin, then is is worth about $1000.00 US dollars. If is a Replica, it is worth $1.00 US dollar.
It is .900 fine or 90% pure silver, for a Actual Silver Weight (ASW) of 0.7734 Troy oz.
The 1925 two centavos coin from Mexico (KM#419) had a mintage of 3,650,000. It is worth about US$2.50 in Fine condition; about US$3.50 in Very Fine; about US$7.50 in Extremely Fine; and about US$38.00 in Uncirculated condition.
Check your coin to make sure you have a genuine US Mint issue and not a cheap knockoff sold on one of those home-shopping channels. A genuine coin should feel heavy, and have its weight and the words ".9999 FINE GOLD" on the back. If that's what you have, it's a bullion coin sold for its gold content. The denomination is purely artificial; its actual value varies with the price of gold. As of mid-2014, approximate retail values are in the following ranges: 1/10 oz: $155 1/5 oz: $365 1/2 oz: $740 1 oz: $1420 Prices don't strictly correlate to weight due to costs of production, packaging, etc.
6-28-11>> Platinum is at $1,674.00 per ounce, but the purity for all US platinum coins is marked as .9995 not .999
Your coin is actually a bullion piece containing 1 oz of "999 fine" silver, i.e. 999/1000 pure metal. As such its value is determined by the current spot price of silver which changes daily. The "one dollar" denomination is artificial. The coin is sold as an investment or collector piece and isn't used for spending.
It depends on the condition of the coin (which is, by the way, a 20 Lepta coin from Greece - the word that you wrote as "AENTA" is actually "ΛΕΠΤΑ"). According to the Standard Catalog of World Coins, 4,752,000 such coins were produced in 1894, and an example in Fine condition is worth US$2.00, an example in Very Fine condition is worth US$5.00, an example in Extremely Fine condition is worth US$25.00, an example in Fine condition is worth US$400.00.
This coin, produced in 1907 with a denomination of 1 öre, is from Sweden. The crowned shield on the obverse refers to the reigning monarch at the time, King Oscar the Second. The coin, made of bronze and with a mintage of 8,250,500, is worth US$0.20 in Fine condition, US$0.50 in Very Fine condition, US$2.00 in Extremely Fine condition, and US$12.50 in Uncirculated condition.
Probably the "IKE" dollar. It's the biggest/heaviest U.S. coin, as far as I can guess. Hope that helps...
There are 32 ounces in a quart, so 5 oz. is 5/32 of a quart. The US quarter coin weighs 0.2 oz, so in 5 oz there are 5 ÷ 0.2 = 25.
No circulating US coins were ever made of sterling silver (0.925 fine). US dimes, quarters, and halves minted up till 1964, and dollars up to 1935, were made of coin silver which is 0.900 fine.
There are two versions of this coin. The more common (KM#71.1, with a mintage of 23.5 million) was produced at the London mint. It can be differentiated by looking at the second set of berries on the left of the back of the coin - only one berry will have a dot on it. According to the Standard Catalog of World Coins, it is worth US$0.75 in Fine condition, US$1.50 in Very Fine condition, US$8.00 in Extremely Fine condition, US$80.00 in Uncirculated condition, and US$150.00 in Brilliant Uncirculated condition. In Proof, this coin is valued at US$2,500.00. The second version of this coin (KM#71.2, with a mintage of 1.5 million) was produced at the Brussells mint. On this coin, looking at the second set of berries on the left of the back of the coin - two berries will have dots on them. According to the Standard Catalog of World Coins, it is worth US$1.50 in Fine condition, US$3.50 in Very Fine condition, US$20.00 in Extremely Fine condition, US$150.00 in Uncirculated condition, and US$350.00 in Brilliant Uncirculated condition. This version was not produced in Proof.