Bill--I do not know the answer to your pack question. Maybe Griffins ( Anthony) or Dave Hornish do. I have over time read there are conflicting views in the hobby as to whether cards 1-50 in 1954 and 131-180 in 1952 actually originated in Canada. I have no personal knowledge on that issue. I do know the 54 gray backs are just as tough as the 52s. I have only examples of both with my sets and have decided not to complete the gray back runs
I do have an unopened pack and the set in ungraded form. And while I collect variations and recurring print defects for all my sets, I have only a couple for 54. The most prominent being Mays which on many cards has a white "band" around his arm. It is easy to find. Not sure if it was a DP, a defect that was corrected, or just a defect that occurred on a bunch of sheets. Because it is quite common and not much recognized I doubt there is any premium on it
I also have card 121 Labine with a red line in the bottom border, 189 Ross in which the 2nd S in his name is defective, and 218 Marsh in which there are several errant yellow splashes on the front of the cards. All these are recurring but scarce. Can send you scans if you want
