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| Catalog Number | 511a |
| Description | EXPO '70 |
| Denomination | |
| Color | |
| Variety | Block of 4 #508-11 |
| Date Issued | 03/18/70 |
| Perforation | |
| Printer | |
| Years | 1970 |
| Sorter | 1045 |
| Watermark | |
| 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=511a |
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