There have been 6 cent postage stamps available almost since there were first postage stamps. Assuming you meant to ask "When did it cost 6 cents to mail a letter?" the answer is: In the U.S. from 7 January 1968 through 15 May 1971.
It was 2 cents for First Class Postage until 6 July 1932 when the postage rate increased to 3 cents.
A postage is 45 cents.
The current cost of a US postage stamp is 44 cents
There was never a 12 cent stamp for regular postage. It went from 10 cents to 13 cents on 12/31/1975. There was however a postage card stamp for 12 cents in 1981.
The G make up rate stamp can still be used for 3 cents of postage. The dove stamp was issued in 1995 when postage went from 29 cents to 32 cents.
The G rate dove stamp was issued in 1995 when postage went from 29 cents to 32 cents. The make up rate stamp can still be used for 3 cents of postage.
The current value for a standard postage stamp is 46 cents.
Right now, a postage stamp is 44 cents.
A first class postage stamp is $0.50 or 50 cents.
The cost of a First Class US postage stamp in 1968 was 5 cents. It was raised to 6 cents on January 8th. It stayed at 6 cents until 1971 when it went to 8 cents.
The current price of a postage stamp is .49 cents. It was increased from .46 cents on January 27, 2014.
In 1969 it would have been 6 cents for first class postage. A post card would have been 5 cents.