About 5 years, from 1963 to 1968.
tuesday
The rate went to five cents on January 7, 1963. It was valid for 5 years.
I mail my letters with 5 cent stamps from the 60's.
The 5¢ Franklin and 10¢ Washington stamps
In the US there were 7 cent stamps printed. Many of the definitive series of stamps included all denominations from 1 to 20 cents and then every 5 cents after that. And the Postcard rate for part of 1975 was 7 cents.
One penny for the first in the world, in England. The first stamps in the US sold for 5 cents or 10 cents ( There were two different stamps offered.)
The first US stamps came in 2 denominations -- 5 cents and 10 cents.
Step 1. Let x be the number of 30 cents stamps. Step 2. Let x-2 be the number of 20 cents stamps. Step 3. Let 30x be the cost of buying x number of 30 cents stamps Step 4. Let 20(x-2) be the cost of buying x-2 number of 20 cents stamps. Step 5. 30x+20(x-2)=360 cents is the total cost of buying stamps. Step 6. The following steps will solve the equation in Step 5:
Just one, as long as it is 42 cents (10/2008). Or if you have some older US stamps, you could put 84 1/2 cent stamps on it. Or any combination of other stamps to pretty much create any number between 1 and 84 as long as they total 42 cents.
Cost for one ounce of first class postage was 6 cents in 1969. Postcards were 5 cents. It was raised to 8 cents in 1971.
In 1960 the cost of a postage stamp was 4 cents. The rate went to 5 cents on the 7th of January 1963.
91 cents or 3 stamps of 44 cents ea.