The US Mint struck half cents during those years. All of them were struck at Philadelphia.
Five cents was the value. That was the cost of mailing a half ounce letter.
Half of a half of a nickel is 1.25 cents. A nickel is 5 cents. Half of that is 2.5 cents and half again would be the 1.25 cents.
If you mean the first coin made by the first US Mint it was the 1793 Half Cents issued in July of that year.
Half a dollar is fifty cents.
That was issued in 1981 when postage went from 18 cents to 20 cents. It can still be used for 20 cents worth of postage.
The 1997 Kennedy half was released for circulation so only a Proof or Uncirculated collectors coins issued from the Mint have more than face value.
There's no such coin. Half-pennies were issued by Britain up till 1984, as well as in other countries of the British Empire / Commonwealth prior to that date. The US issued half-cents from 1793 to 1857 so if that's what you're referring to please post a new, separate question with the coin's date.
On March 3, 1863, the US issued its first postage stamps, they were 3 cents, for a one half ounce letter.
50 and a half cents as a decimal is 0.505
Kellogg
No. 025 cents is 25 cents.
Half of 50 cents in a fraction form would be 25% of one dollar. Half of fifty cents would be 25 cents. A person cannot purchase very much for 25 cents.