The highest-value cents are generally considered to be various varieties of the so-called "chain" cent struck in 1793.
Not all varieties are available in the same condition so it's not possible to pick a single one that's most valuable, but as of 09/2008 the highest prices quoted among the various types is in the range of $625,000
1936 is a common date wheat penny, most coins in average condition are valued at 3 to 10 cents
If you are referring literally to "half a penny" - that is, to a penny cut in half - then the answer is "little to nothing." If you are referring to a coin whose denomination is a "half penny", then it depends on the country of issue and the condition of the coin in question. The US did not produce a half cent coin in 1880, and neither did Canada. An 1880 Half Penny from Great Britain is valued (according to the Standard Catalog of World Coins) at US$2.50 in Fine condition, US$6.50 in Very Fine condition, US$45.00 in Extremely Fine condition, US$150.00 in Uncirculated condition, and US$400.00 in Proof condition. An 1880 Half Penny from Jamaica is valued at US$2.00 in Fine condition, US$4.00 in Very Fine condition, US$20.00 in Extremely Fine condition, US$55.00 in Uncirculated condition, and US$475.00 in Proof condition.
Coins in average circulated condition are valued at $1.00-$3.00 a real good uncirculated coin could be as much as $30.00
For an accurate value US large cents need to be seen but in general are valued at $25.00-$50.00 for coins that show a lot of wear. Better grade are $80.00 or more
Assuming you're referring to a US cent rather than a British penny: 1793 LARGE CENT - FLOWING HAIR - STRAWBERRY LEAF - SHELDON NC-3 - ANR 09/2004:130 - $414,000 This is the highest price paid that I can find.
1936 is a common date wheat penny, most coins in average condition are valued at 3 to 10 cents
$0.01
Some cents tone to a color that looks like gold but the US has never made a gold one cent coin. It's a penny.
A US Indian Head cent dated 1897 is valued at $1.00-$3.00 retail in average circulated condition.
1942 Southern Rhodesia One Penny with Uncirculated Condition valued upto $110.00 US. and Extra fine condition valued upto $65.00. Hope it will help..
If you are referring literally to "half a penny" - that is, to a penny cut in half - then the answer is "little to nothing." If you are referring to a coin whose denomination is a "half penny", then it depends on the country of issue and the condition of the coin in question. The US did not produce a half cent coin in 1880, and neither did Canada. An 1880 Half Penny from Great Britain is valued (according to the Standard Catalog of World Coins) at US$2.50 in Fine condition, US$6.50 in Very Fine condition, US$45.00 in Extremely Fine condition, US$150.00 in Uncirculated condition, and US$400.00 in Proof condition. An 1880 Half Penny from Jamaica is valued at US$2.00 in Fine condition, US$4.00 in Very Fine condition, US$20.00 in Extremely Fine condition, US$55.00 in Uncirculated condition, and US$475.00 in Proof condition.
KUWAIT
An uncirculated UK 1912 penny can be worth up to $25. In good condition, the penny is valued at about a dollar.
The first US penny, the Fugio cent, goes for around $100 in very poor condition to several thousand dollars in the highest states of preservation.
Highest valued currency is Kuwaiti Dinar. The latest updates are found in http://en.wikipedia.org/wiki/Highest_valued_currency_unit Mr.IK
Kuwaiti Dinar
9 million