I believe the National Red Stamp was used for value much like the S & H Green Stamps. The cash value is 1 MIL, or 1/1000 of a U.S. Dollar. I found this among my grandparents collection of Green Stamps. These date back to the 1950s or 1960s. The wording on the stamp is NATIONAL RED STAMP GIFT SEAL COMPANY 1 MIL VALUE.
The value of one Anna red stamp is 20 cents. It is much higher on Ebay.
The United States Postal Service commissions stamp designs. The USPS is a branch of the federal (national) government.
Penny Red is from Australia and is considered a favorite among stamp collectors around the world. With it's distinctive design and red color it is very recognizable.
serrated edges
The value of a one penny red stamp is an estimated $1.50 or even less depending on the condition. They can be purchased on eBay.
gandhiji
The adolf hitler stamp is worth about roughly 1,350 in this era. you are a very lucky to have this one of a kind stamp.
Red cross
2012
2 cents
The stamp is used for quality control and to say the meat is safe for human consumption. Also that the meat has passed health tests before being sold. Red is not the only colour of stamp used but it is for the purposes descibed above.
This stamp is a picture of Uncle Sams's hat in red, white and blue. You can see it at http://alphabetilately.com/G.html