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Is it worth looking at the cancelled stamps I've got. Heard cancelled stamps have no value. Is that true?
Is it worth looking at cancelled stamps? ALWAYS! You never know what you might find.
There are some collectors who prefer cancelled stamps, especially on older issues, as it reveals so much more about the stamps use than one might imagine. Anyone can buy a mint stamp at a post office; when it gets used on a piece mail it retains a special character all its own.
Whether or not used stamps may be worth much in value is another story. Generally, used US Stamps from the 19th century are the most desirable and retain some value. Except for the higher value denominations, US stamps of the 1920's through to the present day probably don't have much value used, but that still doesn't mean they are not collectible.
Even if the used stamps may have little or no value to you, there are always organizations that would be grateful for donations of stamps such as veteran's groups, charities, senior centers, youth centers, etc., as a means to get different populations interested in stamp collecting as a hobby and as a way to learn about the subject matter depicted on the stamps.