I'm sure there is a huge difference in the level of concern with regards to centering and corners based on whether you focus on pre-war or post-war cards. Since I collect the latter (and they are 'easier' to find), I look for sharp corners first, while centering (as well as other things) is less important. If I collected the older stuff, I'm sure the sharpness of the corners would drop down on my requirements list, simply because it would be much harder to find the cards I want, so I couldn't afford to be too picky.
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