In a country where the abolition or abandonment of slavery, or of the institutions or practices mentioned in article 1 of this Convention, is not yet complete, the act of mutilating, branding or otherwise marking a slave or a person of servile status in order to indicate his status, or as a punishment, or for any other reason, or of being accessory thereto, shall be a criminal offence under the laws of the States Parties to this Convention and persons convicted thereof shall be liable to punishment.