How do you see on a stamp how much the stamp cost?

US postage rate increases -- for ordinary first class letters . June, 1932 up to 3 cents from 2 cents. July, 1958 up to 4 cents Jan , 1963 up to 5 cents July, 1968 up to 6 cents May, 1971 up to 8...

It was 2 cents from July 1, 1885 to November 3, 1917. The postage rate in the US was also 2 cents for one ounce of first class mail from July 1 1919 to July 6, 1932. It was also 2 cents from July 1,...

The US domestic rate for an ordinary 1st-class letter was 2 cents in 1901.

You will need to consult the catalogs and do some research. There are lots of stamps issued and they vary in value from almost nothing to some nice values. Most libraries will have a copy of Scott's...

In the US a stamp cost 3 cents beginning in 1863. That covered half an ounce of postage. Prior to that it was 5 cents.