1 ounce.
.5 oz.
There have been 98 cent stamps for a while. That is the current rate to send a letter to most foreign countries from the US. It was also the airmail rate for a full ounce.
as of September 2009 , a 98 cent stamp will get you to most countries. to be sure, check at USPS com
no, because for each letter, you can only use 1 stamp. Yes, you certainly can in Canada, and most other countries. Postage paid is postage paid, regardless of the stamp denomination. Assuming, of course, that the stamp total is sufficient to cover the required postage.
Not much maybe $1 or $3 at the most.
One ounce. That's four sheets of typing paper plus the envelope.
There were no 6 cent stamps in Germany. They used pffenings and Deutschmarks. . A 6 pffening purple Hitler stamp is worth .20 used and mint. Most Hitler stamps are worth about .20 cents
One sheet of the 24 cent airmail stamp was printed with the airplane printed up-side-down and sold before the error was discovered. This is undoubted the most famous error stamp in US postal history.
Most dealers are not going to be interested in buying a single stamp. You might try selling it on an auction site, but the postage cost will be more than the value of the stamp.
Cost of a postage stamp was dependant on the face value of the stamp. The most common rate stamp is for First Class Mail. In the United States 1925 that was 2 cents for the first ounce.
The US has issued many dozens of red 3 cent stamps. It will take a bit of work to identify which stamp you are referring to. I would recommend spending some time looking at a US Postage Stamp Catalog to identify the specific stamp. The bonus is that most catalogs will give you an idea of value.
You are probably thinking of the inverted Jenny air-mail stamp --probably the most famous error ever in US stamps.
Scott number 1581 It can be purchased mint or used for .15 cents. Most dealers won't purchase a single stamp.