The collection of "back of the book" issues including Postage Dues 1912-48 with 1945 $6 block of four - one showing "$5" error of value, $8 and $10 imperforate between varieties, Military Post with General Office 1942-44 16c. perf.11 unused, Parcel Post, Officially Sealed labels and temporary labels and meter marks from the interim Gold and Silver Yuan period. (several hundred)