Silver certificates were never formally withdrawn so you could still spend one, but you can't exchange them for silver anymore.
However depending on its date it may not make much sense to spend a silver certificate. Common ones (mostly 1957 $1 bills) are pretty much only worth a bit more than face value to collectors, but some older-date silver certificates can be worth much more.
Bills printed from 1928 till 1957 (the last series year) will have the words Silver Certificate printed across the top of the bill's front. In most but not all cases, the seal and serial numbers will be printed in blue ink. Some special WWII bills may have brown or yellow seals. Older (pre-1928) bills may be more difficult to identify. Some will say Silver Certificate, but others may use words such as "5 silver dollars" or "one dollar in silver coins", etc.
A few cents for the paper it's printed on. It's a novelty item that you can find in some gift shops and online sites. The highest-denomination bill ever printed for general use was worth $10,000. There are no genuine "million dollar" or "billion dollar" bills.
The British Pound is backed by silver where as the US dollar isn't backed by anything as use to be in the 18th century.
The FACE value of these bills is $1 but their collector value varies considerably. For example, circulated 1957 / 57A / 57B silver certificates and some later-series 1935 bills are quite common among collectors and sell for only 25 to 50 cents extra. Others, such as bills specially printed for use in Hawaii and North Africa during WWII, and bills dated 1934 and earlier, can be worth a lot more. If you have questions about a specific date, check to see if there's a small "series letter" next to the date, then check for questions in the form "What is the value of a [date] [letter] US [value] silver certificate?", e.g. "What is the value of a 1953 A US 10 dollar silver certificate?
Silver certificates were a form of currency issued from 1862 to the early 1960s, although the last ones were all dated 1957. During those years the government both controlled the price of silver and kept large quantities of the metal on deposit with the Treasury. Each $1, $5, or $10 certificate that was printed represented that many dollars' worth of silver on deposit; i.e. the bills were "backed" by silver. The bills could be exchanged for an equivalent value in silver metal (coins or bullion) at many banks. In the early 1960s the demand for silver skyrocketed due to its use in electronics and film photography, among other things. That put pressure on the government to deregulate the metal's price and make a profit by selling its huge stocks on the open market. However, deregulation and sale meant that there was no longer a fixed dollar-for-dollar backing of each bill in circulation. People started gaming the system by exchanging bills for silver, waiting for the price of silver to change, then selling the silver, and so on. To stop losses, the Treasury took two steps in the mid-1960s: > First. production of all silver certificates was discontinued. $5 and $10 certificates had already been suspended in the 1950s, and starting in 1963 all $1 bills were issued as Federal Reserve Notes that couldn't be exchanged for precious metals. > Second, any silver certificates still in circulation were no longer accepted for redemption in metal, although they could be spent at face value.
That was written on the old US $1 silver certificate. At they time they were still in use, they could be redeemed for a dollar's worth of silver coins, but this practice was discontinued in the 1960s. The bill is still legal tender at face value today.
It's easy if the bill was printed from 1928 to 1953, the last series year $5 silver certificates were issued. All bills will have the words SILVER CERTIFICATE in the banner across the top, and with one exception they'll all have blue seals and serial numbers. The only exception is a series of special 1934 and 1934 A bills printed for use in Hawaii during WWII; these have brown seals but still say Silver Certificate. Older bills may have the words Silver Certificate or they may say something like "Five Silver Dollars" on them.
It's correct if you use an old Silver Certificate - it's not if you use the a current Federal Reserve Note.
Despite the word HAWAII on it, your bill was actually printed in Washington for use in Hawaii during WWII. Please see the question "What is the value of a 1935 US 1 dollar silver certificate with HAWAII on it?" for more information.
The seal color is actually yellow but has darkened with age. Yellow-seal bills were printed for use by troops in North Africa during WWII. There's more information at the question "What is the value of a 1934 A US 10 dollar silver certificate with a yellow seal?"
It was actually printed in Washington for use in Hawaii during WWII. The bills were a different color and had the name HAWAII in large letters so they'd be easy to spot and could be declared worthless if captured by the Japanese. There's more information at the question "What is the value of a 1935 US 1 dollar silver certificate with HAWAII on it?"
Your bill was specially-printed during WWII for use in North Africa. The seal color was originally yellow but may have darkened with age; please see the question "What is the value of a 1934 A US 5 dollar silver certificate with a yellow seal?" for much more information.
The layout of the back is essentially identical to modern $1 bills. The front is similar but with some obvious differences, such as the words "Silver Certificate" and "In silver payable to the bearer on demand"; a blue seal and serial numbers; and the absence of a Federal Reserve seal. Beyond that, an actual picture is much more instructive. While it's not Answers.com policy to say "use the Internet", that's the best approach in this case. You can use any major search engine to look for "1957 1 dollar silver certificate images" or a similar phrase.
The old silver dollar first went into circulation in 1935. Then in 1968, the size was reduced and the composition changed from silver to pure nickel. In 1987, it was changed again to the smaller golden dollar still in use today.
HAWAII-overprint bills weren't made in Hawaii. They were printed in Washington during WWII for use in Hawaii in case the Japanese captured the islands. There's more information at the question "What is the value of a 1935 US 1 dollar silver certificate with HAWAII on it?".
Please don't assume that every non-current bill is a silver certificate. The banner across its top and the green seal indicate it's a Federal Reserve Note, the same type of paper money in use since the 1960s. There's more information at the question "What is the value of a 1995 US 5 dollar bill?"
Small-size silver certificates dated 1928 through 1957 are easy to recognize. They all have the words SILVER CERTIFICATE in the banner across the front, they do not have a Federal Reserve letter, and except for certain WWII bills they all have blue seals and serial numbers. Special WWII bills with brown or yellow seals were printed for use in threatened areas, but the banner across their top front still identifies them as silver certificates or Federal Reserve Notes as applicable. Older large-size silver certificates printed before 1928 may be more difficult to recognize. Some will still have the wording across the top, but others may say something like "Five Silver Dollars" or "One Dollar in Silver Coins".