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| Catalog Number | O9a |
| Description | no period after "S". |
| Denomination | 50c |
| Color | red purple |
| Variety | Ovpt. O. H. M. S. |
| Date Issued | 1949-50 |
| Perforation | 12 |
| Printer | Engr. |
| Years | 1949 |
| Sorter | 4337 |
| 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=O9a |
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