Cancellation of Stamps
Any person using or affixing stamps must so deface the same as to render them unfit for further use by writing or stamping his initials and the date thereon with ink, or by cutting and canceling such stamp with a machine or punch, which will affix the initials and date. The cancellation should not so deface the stamp as to prevent its denomination and genuineness from being readily determined.
In addition to the above, stamps of the value of 10 cents or more must have three parallel incisions made by some sharp instrument lengthwise through the stamp after the same has been attached to the document, except where the stamps are cancelled by perforation.