$0.85 mint, $0.25 used
This stamp is Scott # 1391. It has a catalog value of 20 cents mint or used.
A commercially produced First Day Covers of standard commemoratives like the Alaska statehood stamp are typically worth a dollar or two. They can be purchased for on eBay or through dealers. Higher value stamps, or specific cachet makers are worth more. A specialized catalog will list the value of a cachet or un-cacheted cover.
That would be Scott number US 1124. A full sheet of these stamps has a catalog value of $11.00.
I mail my letters with stamps from the 60's. Only high denominations and other oddities from this era can bring any value to the stamps. Use it as postage.
That is Scott number US 942 issued in 1946. It has a minimal value and can be purchased for 50 cents in mint condition and 15 cents used.
The tulip stamp was marked as the F Flower stamp. It has a face value of 29 cents.
It is a forever stamp. It is good for the current value of a first class stamp.
The value of any stamp depends on several variables, one of which is the condition. Another is that it is worth whatever someone will pay for it. The 1952 Mount Rushmore National Memorial 3 cent stamp's value is listed by hobbizine.com as 20 cents for a used stamp and 60 cents for mint condition. The 1939 50th Anniversary of Statehood - Washington, Montana, North and South Dakota 3 cent stamp's value is listed by hobbizine.com as 20 cents for a used stamp and 90 cents for mint condition. An online search shows prices from as low as 10 cents to as high as $1.25.
The value of a Top Value Stamp, "Toppie," the elephant sign is approximately $42. The better the condition of the stamp, the more money it will be worth.
Face value of the original stamp was $0.20
The value of the 1910 1955 penny stamp value is one pound.
The stamp-postage value of a stamp is visible on the front of the stamp.