Doubling of dates is fairly common for the George VI series, there are even Trends listing for such varieties in 1938, 1939, 1940 and 1951. Hans Zoell also found others, or portions of dates doubled in almost every other George VI year. In 1952, he noted the 19 're-entered' on 10-cent coins, calling that R275b, but no mention of the entire date doubled.
I suspect this is a scarce one, because there is no mention of any 'double 1952' or 'double date' 1952 10-cent coins sold in the 2006-2008 Ashrap reports. Perhaps Zonad can check his database for sales post 2008?
That said, there is a circulated example for sale here:
http://www.ebay.com/itm/Canada-Geor...330850887404This is one I found recently, in MS-62.

Happy hunting!
(PS - for those of you who like to collect these images, for updating your "variety books" - you know who you are - I'll remind you that this image is my intellectual property).