Proof Private Die Proprietary revenues, plate proofs on card (betw. RO152P4-RS274P4), 24 different, better items include nos. RS4P4, RS18P4, RS19P4, RS39P4-RS41P4, RS144P4-RS146P4 and RS153P4 (last very rare as the issued stamp), nearly all are fresh, few have faults, otherwise a fine-very fine lot est.