In the US postage stamps are always valid. You do still have to have enough to cover the current postage cost. And Forever stamps are always valid for one ounce of first class mail, regardless of the actual cost.
Yes, first-class stamps are always valid for mailing letters within the same country, regardless of when they were purchased. However, the cost of postage may increase over time, so additional stamps may be required if the postage rate has gone up since the stamps were purchased.
Yes, the Forever stamps are good for as long as you have them! I continue to use ones purchased about a year ago and have had no problems. If you look they don't have any numeric value on them.
They are still valid, but you have to add additional postage to make up the 44 cent rate. Unless they are the Forever Stamps, in which case you can still use them for up to an ounce of First Class postage.
According to the USPS web site, "Forever Stamps can be used to mail a one-ounce letter regardless of when the stamps are purchased or used and no matter how prices may change in the future." The United States Postal Service and its predecessors have not devalued any US Postage stamps since the Civil War.
It's unclear what you mean by seal. If you want to keep old postage stamps, you should buy a proper book to store them in, use hinges (some like them, some don't) or sleeves to protect them. You can't regum the stamp if that is what you mean. Once the gum (glue on the back) is gone, it's gone. You are not allowed to regum it.
The price of a US postage stamp has gone up to 45 cents in 2012. This price is for a regular letter with a weight of 1 ounce. If your envelope is overweight, there will be an additional charge of 20 cents for each additional ounce. There is no discount to purchase a book of stamps.
Crafting in America has gone viral and is a big boom industry. Making homemade greeting cards with the use of rubber stamps is a very popular past-time. The Christmas rubber stamps can be purchased at Michael's, Jo-anne Fabrics and the 123 Stitch website.
Postage hasn't gone up...yet. The U.S. postal service has requested an increase in postage that will increase the price of a First-Class stamp by 2 cents, from 44 cents to 46 cents. If approved, this change will take effect on January 2, 2011.
Not in the UK or the United States. You can use them even when the price has gone up after you bought them, as long as the face value adds up to the correct rate.
This is a common stamp which is easily obtainable. No stamp in good condition is worthless to a collector. This one is a part of a commemorative set and so is not the most common. Mint US stamps always worth their face value if one can find use for them for postage. Common mint stamps retail for about twice face . The minimum retail price for used stamps varies with the dealer but is around 15 to 25 cents. This one might sell for up to 50 cents. As for selling common stamps-- dealers do not buy them one at a time. They get them by buying collections or accumulations of thousands of stamps. They usually have all the common stamps they can sell because they get them along with the scarcer stamps.
Once its gone its gone.
The current price of a postage stamp in the United Kingdom is 60 pence, or a little less that one U.S. dollar. The price has gone up quite a bit in recent years as the cost of maintaining the postal service has also increased.