Customs duty exemption formalities require a written claim with a triplicate exemption certificate and authorised countersignatures. Customs duty exemption requires a written claim at clearance with a triplicate exemption certificate in prescribed Forms; two copies go to the Principal Commissioner or Commissioner of Customs at the port and one copy to the Protocol Division. Certificates for official use must be signed by the Head of Mission or authorised officer, consular certificates by the Consular Officer or authorised post officer, and personal use certificates by the privileged person, all subject to countersignature by the Head of the Mission or authorised officer. Motor vehicle exemptions follow analogous triplicate form and signature rules.