You had me worried - my eyesight is terrible (worthless) close-up, but I thought when I magnified things I was okayNo, I think you're right. At first glance, I thought your '52 was underscored (with a smaller 2), but actually zooming in they are a similar size.
I have had this issue with the 'small' vs 'large' date number thing, for a while. Sometimes the number is very obviously large, as in most 1960's shells, but for post-patent pipes in the '50s I am often befuddled.