An example would help - do you mean a "Forever" non-denominated stamp? IF so the answer is yes. If something else what are the characteristics of the stamp in question. Does it have a stated value ?
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re: First Class stamp
"Can a First Class stamp be used on a letter now, as a 49c stamp, not making the difference in price? "
No, each of the "First Class" stamps of the USA, as opposed to the "Forever" stamps, had an assigned value equal to the first class rate at the time. That assigned rate did not go up with the first class rate. I have seen posters of these stamps (probably from a Post Office origin) that indicates the assigned denomination of each. Scott catalogue will also show the denomination in parentheses.
"Forever" stamps, on the other hand, are always good for a first class letter, regardless of how high the rate goes.
The Canadian equivalent of the USA "Forever" stamp is the "P" stamp (for "Permanent").
Roy
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I believe that before the forever stamps came to light there were the so call letter stamps, the G being the last one, they are still good but have to be supplemented with and additional stamp or stamps to meet the current postal rate, I was under the impression that first class nominated stamps will have to be treated the same way, isn't this the case?