This image was copied from wikipedia:en. The original description was:

British Guiana 1¢ Magenta Stamp

This image of the 1c Magenta from Commons is not in fact an image of the actual stamp. For example, the actual stamp is typeset and the lettering has serifs. The Commons image has sans serif lettering. The ship is only partly present on the actual stamp, but perfect on the Commons image, etc. I'm not sure what the Commons image is, but it is not an image of the actual stamp. It may be an artist's (Photoshopped) conception of what it would look like if clean. See discussion on Wikipedia:Talk:British Guiana 1c magenta#Wrong image

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https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse