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I started with pre-WWII, but as I invariably found cards from pre-1920 more attractive (as well as being more expensive I should add), I began to focus more on those.That said, I still pick up the odd set from the pre-adhesive regime (the 1920s usually). Certainly the older the card, the better the quality and generally-speaking the more pleasing to the eye, at least to my eye(s).