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| SetID | 158 | 
| SubSetOf | 0 | 
| SubSetOrg | |
| Area | 2 | 
| SubRegion | 0 | 
| Code | RC134 | 
| Type | a | 
| Design | Dr Sun Yat-sen small T near tie | 
| Perf | 12½ | 
| Paper | |
| Gum | none | 
| Printer | Central Trust, Shanghai | 
| Printing | Recess | 
| Designer | |
| Engineer | |
| Qty | 0 | 
| Issued | 19490101 | 
| Exact | N | 
| SetName | SYS 13 with secret marks printed by Central Trust | 
| ShortName | SYS 13 (Central Trust, Shanghai) | 
| InYearBook | |
| InSet | 2 | 
| Sht | 0 | 
| MS | 0 | 
| Bklt | 0 | 
| Face | |
| Comments | Plates made from Dah Tung die with various secret marks added | 
| PicAspect | 0.742 | 
| SG | 1161-2 | 
| Ma | |
| Scott | 895-6 | 
| Chan | G137-8 | 
| Mi | |
| Yang | |
| Yvert | |
| OptOn | 0 | 
| Wmk | None | 
| DesignSize | |
| StampSize | |
| SheetSize | |
| Mint | 1 | 
| Used | 2 |