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This one is the A24 series Scott catalog #37 from 1868. According to Scott there were 4 color variations on this one. So you have 37, 37a, 37b, and 37c. The question is which one do I have.
It's quite a bit more likely that you have Scott #41, not Scott #37. It can be quite difficult to tell some of the various Small Queen stamps apart from one another, unfortunately. A direct quote from "Canada's Three Cent Small Queen" by Ronald I. Ribler: "Virtually all collectors of this stamp have, at some time, experienced difficulty in determining with any confidence which variety of the stamp was at hand."
90% of the copies of Scott #37 have a tiny guide dot below the lower left value tablet, and that appears to be missing from your copy. Also, #41 is a far more common stamp, and the considerably lower catalogue value is tied to that.
These scans (rather wobbly, sorry) provide a clue on how involved it can be to try to figure out which stamp is which, when you start dealing with shades and perforation variations. The Kiusalas gauge is a precision gauge which measures perforations based on thousandths of an inch between pins.
A good introductory article dealing with Small Queens is found at the Royal Philatelic Society of Canada's website, although it can be a bit tricky to navigate your way through all of the pages.
http://www.rpsc.org/Library/SmallQu...l_Queens.htmRyan

