9 Pictorial Postmark Service
9-1 Types of Service
9-1.1 Hand–Back Service
9-1.2 Mail–Back Service
9-2 Conditions for Servicing
9-2.1 General Information
9-2.2 Special Materials on Which Postmarks Are Requested
9-2.3 Items That Must Not Be Serviced
9-2.4 Service Limitations
9-3 Extending Mail–Back Service
