Not really. It might be of interest to a collector, but without the cancellation, it isn't worth anything other than the value of a used stamp.
what value of first day cancellation wash. state centennial set of all wash Post Offices
I believe you mean Scott Catalog #2446, 25 cent, Gone With the Wind, issued on March 23, 1990. This stamp came in a set of 4 stamps honoring 'Classic Films'.The 'First Day Cover' for this issue was issued at Hollywood, California on March 23. There were 863,079 'First Day Covers' issued with all four stamps or single stamp.The value for this 'First Day Cover' is:Four stamps on cover: = $5One stamp on cover: = $2.50(Scott Specialized Catalog for US Stamps, page 401)
Most for normally issued stamps are going to be a couple of dollars to purchase.
There is a bit of a conflict here. A stamp cannot be 'Mint' and have a postmark on it, particularly from Canada. There are a number of possibilities here: The postmark is a First Day of Issue and someone asked the postal clerk to stamp them after buying the sheet. Not much value to them as they can't be used for postage and most collectors prefer a full cover with cancellation. You might get a bit more than what a used stamp would bring. The postmarks are actually overprints. Canada has done a number of overprints to change value or commemorate special events. These could have good collectors value to them. Someone re-gummed a bunch of used stamps. Possible, but no real reason for it. It is also possible to use a humidor to remove stamps from paper and 'reclaim' the gum on the back. Most collectors would classify these as used stamps.
Yes, an address will affect the value. On older stamps (pre-1940's) it will not make much of a difference.
There are many factors involved to determine cost. Stamps of this era were produced in large quantities. If the stamps are on envelope, they could be worth more than a mint or unused stamp. Consult a catalog to identify the stamp and to determine a value. You can find them at your library.
What stamps? First postal stamps were used in 1840.
These are CTO or Cancelled to Order stamps often produced by places like Liberia. The philatelic community refers to these as wall paper. They have little to no value.
Commercially produced First Day Covers of standard commemoratives like this are typically worth about a dollar. The Bicentennial stamps may bring a slightly higher value. Higher value stamps, or specific cachet makers are worth more. A specialized catalog will list the value of a cachet or un-cacheted cover.
Yes. Postage does not have to paid through individual stamps; as long as the value of all stamps placed on the envelope is enough to cover the cost that envelope carries, any number and value of stamps can be used.
That is what the US issues stamps for, so that you can send mail to anyplace in the world.
Without knowing what stamps you are refering to, it is impossible to offer a value. Stamps are issued from virtually every country in the world, as well each country issues many different stamps each year.