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| Catalog Number | O23 |
| Description | Combined Reaper-Harvester Ovpt. G |
| Denomination | 20c |
| Color | slate |
| Variety | |
| Date Issued | 1950 |
| Perforation | 12 |
| Printer | Engr. |
| Years | 1950 |
| Sorter | 4354 |
| Watermark | Unwmk. |
| Series | |
| Paper | |
| Ebaylink | http://www.ebay.com/csc/Canada/3478/i.html?LH_Complete=1&_armrs=1&_from=R10&_ipg=&_pcats=260&_sop=16&_nkw=O23 |
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