Protected by copyright, therefore a free use alternative won't exist. There is no possible commercial disadvantage to the copyright holder by using this image of a stamp in a Wikipedia article because the stamp's value is in the physical stamp, not the design.
Licensing
This image is of a United States postage stamp produced in 1978 or later. The copyright for it is held by the United States Postal Service. It is believed that the use of postage stamps
to illustrate the stamp in question (as opposed to things appearing in the stamp's design)
Usage that does not fall under fair use requires a license from the USPS. This includes usage of the stamp's artwork to illustrate its subject, rather than the stamp itself. Fair use//en.wikipedia.org/wiki/File:Stamp-USPS_1998_Breast_Cancer_Research_semi-postal.jpg
true
Fair use
true
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