263.  Whoever, fraudulently or with intent to cause loss to the Government, erases or removes from a stamp issued by the Government for the purpose of revenue, any mark put or impressed upon such stamp for the purpose of denoting that the stamp has been used, or knowingly has in his possession, or sells or disposes of, any such stamp from which such mark has been erased or removed, or sells or disposes of any such stamp which he knows to have been used, shall be punished with imprisonment for a term which may extend to 3 years, or with fine, or with both.