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Really?
Are you surprised that it is worth that much, or are you surprised that it isn't worth more? Old stamps can run anywhere from the catalog minimum of 20c (not uncommon to see this) to millions of dollars (very rare of course).
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It appears to be a Scott # 23 1872 of the Montreal and Ottawa Printings , Perf 12 Catalog value for used $2.25. That would be for one in Fine / Used condition.
I'm deferring to your basic ID, as I am not a specialist in Canada.
However, I think you might have typed the wrong catalog number while posting. The Montreal/Ottawa printing for perf 12 in the 2010 Scott is Canada #36 and is still listed at $2.25.
There is a moderately more valuable blue-green variety (yours appears to be green) and also a perf 11.5x12 (you should measure your perfs).
Of course, there are other plate varieties and what-not that are not listed in Scott but are listed in specialized catalogs such as Unitrade. I'll let someone more experienced with Canada fill in those blanks.