That depends on which coin. Lincoln cents, they're worth maybe 10 cents each in decent condition. War nickels dated 1942-1945 actually contain a bit of silver (and are the only nickels that do), which make them worth more than a dollar each. Then circulated Mercury dimes, Washington quarters, and Standing Liberty half dollars are all silver, currently worth about $1.50, $3.60, and $7.25 respectively (as of 10 January 2014).
Most halves from the WWII era are common among collectors. Anything that shows evidence of wear will mostly be worth its silver value, around $7-8 as of 03/2010.
yes
The Progressive Era, which actually extended from the 1890s to the 1920s.
Cold War :)
Hello, I've had a WWI era poster called Fight World Famine! Join the Boy's Working Reserve for about 15 years. I bought it when I was a lad of 11. I've framed it and have it on the wall. I was curious one day and googled it, surprisingly it was easy to find its worth by checking a few vintage sites. Mine is worth about $270 or so, which is nice considering I bought it for $70. Most good condition posters of this vintage are worth a similar amount.
It can be. Both coins and bills are collectible. Value would depend upon the scarcity of the particular example you have, and on its condition. Uncirculated coins can be quite valuable. If these are souvenirs brought back by a soldier chances are they are not uncirculated coins though.
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Some Russian coins of that era are extremely collectible, particularly the silver ones. Bills are as well. Book value would depend on exactly what you have, and on its condition. Ultimately coins/bills are worth what somebody is willing to pay for them. For more desirable items you can feel fairly sure of getting approximately book value on eBay. Good pictures help tremendously on eBay.
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Your stamp is not rare and is not worth anything. Most German stamps of this era are worth far more if they are used, and the cancellation will ultimately determine the value.
They didn't have any bills - paper money - so it was coins people traded with.
Most halves from the WWII era are common among collectors. Anything that shows evidence of wear will mostly be worth its silver value, around $7-8 as of 03/2010.
No anything from that era is over produced the odd card may have a little value but not highly collectible
The British pound of the Victorian Era was the most valuable currency in the world. It was worth about 100 times more than what it is worth today.
A 1965 Venezuelan steel coin is not likely to be worth much more than its face value. If it proves to be in excellent condition and has rare stampings of some sort, it could be worth considerably more, but most coins from that era don't have any real collector's value.
All coins, even gold and silver, will tarnish, but rust is iron oxide, so only coins with iron in them will rust. The only ones I can think of are the steel 1943 US cents and some European Coins from the WW2 era.