In the US the official First Class rate was raised to 18 cents on March 22, 1981. That covered the first ounce of weight. Any additional ounces , or fractions thereof, were 17 cents.
Around 1970
On May 11, 2009 , ordinary first class stamps went up to 44 cents.
May 12, 2008, 41 cent stamps go up to 42 cents.
For a 3.4oz envelope you will need to purchase 94 cents worth of stamps. If you go to a post office they will charge you 94 cents, place the stamps on it for you, and there is a drop box right there!
Yes - Three 44- cent or forever stamps will work, but the postage is only 98 cents- you would wasting 34 cents. You can buy 98-cents stamps or 10-cent stamps at the PO. (44 + 44 + 10 = 98)
In the year 1998 in the United States, First Class postage was 32 cents. It did not go up to 33 cents until January 10th of 1999. That covered the first ounce of postage, the second ounce was 23 cents.
Typically you will need three stamps. The first ounce will go for the standard first class postage rate. The second and third ounce will go for a reduced rate. Currently that would be 45 cents for the first ounce and 20 cents each for the second and third.
They go up on May 12, 2008. I looked it up on USPS.com
Three and a half ounces of stamps is a decent amount of stamps. It will vary depending on whether they are still on paper or not and whether they are definitives or commemoratives. You could probably find about 100 to 150 stamps in 3.5 ounces of stamps.
1857 was the last year for US large cents.
It takes 98 cents to send a letter to Brazil from the US
Will likely go up one or two cents this May.
42 cents. But if you don't want to buy a 42 cent stamp then go ahead and put 42 1 cent stamps on there.