Canadian Version of 52 topps Mantle

[Billwinkle]

Lets start off with "great site enjoy it allot" . As always I am in some need of assistance. My brother and I have collected cards since we were kids. He is 74 now I am 55. I was surfing the site and notice the mention of "grey Back Canadian 1952 Mantle's". My brother has somewhere in excess of 800 52's and at least 2 of all the big cards in the set, including the Mantles. As we are both just passive baseball collectors (more into hockey) we were not aware there was more than one version of these cards until just a year or so ago. At that time we learned there were two versions. Is the Canadian version a 3rd version and if so does it command an even higher premium. Also does it come with all the other difference in American variations? We are from Canada and the cards were bought by him here in Canada when he was a kid. He is in the process of convincing himself to sell because his health is failing but he doesn't want to give the stuff away. I am traveling to his place in a couple of weeks and we want to catalog and inventory his cards. Not sure when or how he is going to sell but he needs to get an inventory of what his collection holds. He doesn't have a computer so I am going to put it on my laptop.