A Little Help With These Please

Ok first off hello everyone I'm evl1, im new to the stamp world. Ok here it goes....i have a box with over 100 unused purple 3 cent George Washington embossed envelopes, I think they call them covers or stationary might be the correct term.. On top of that I have another 100 unused magenta Ben Franklin 4 cent stationary envelopes unused in the same condition.. I need their specifications and if possible a estimated monetary value..thank you

*** Edited by Staff to remove YELLING ***

OK...here goes....
the 3c envelope: #U534...you can add 43c more postage and use to mail a letter
the 4c envelope: #U536...you can add 42c more postage and use to mail a letter.
Both are minimial value....common.

You are correct the term is "postal stationery". The envelopes are identified as the 3-cent Washington (Scott No. U534) issued in 1950 with a catalog value of 50 cents each; and the 4-cent Franklin (Scott No. U536) issued in 1958 with a catalog value of $1 each.

Unfortunately "catalog values" of these envelopes is not a true indicator of market value, as the envelopes are very common and therefore catalog values are typically 10% or 20% of those listed values at best -- in major quantities, the value is probably even less.

The envelopes look as if they were imprinted with a return address, probably ordered by an individual or business back in the day. Of course, the envelopes are always valid as US Postage for their face value of 3 and 4 cents respectively, meaning that if you wanted to affix an additional 43 or 42 cents postage to the envelope, you could use them in the mail today.