With the help of Al (ALR-bishop), I feel like I've been able to distinguish between the '54 Topps and the '54 Topps Gray Backs or '54 Topps Canadian.
However, this one that just surfaced on eBay leaves me a little baffled. SGC has the card labeled as a 1954 Topps Canadian, but the back has me questioning whether or not that label was a mistake. Thoughts?
I've attached a scan of the front and back of the card on ebay, and then a comparison of the backs that I have in my possession of the same card.
eBay card:
My two cards:
Cream-colored Back (regular '54):
Gray Back ('54 Topps Canadian)