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The limit that I use size wise for “cards” is standard cabinet card, which is approximately 4.25” X 6.50”. The W600’s go a little above and beyond but are such an integral part of the hobby that I didn’t want to omit them from rookie card consideration. Another major factor in this decision has to do with the card stock used, they were obviously intended to be collected and saved long term as opposed to many of the other “oversize” items of the era which were made of much thinner paper, making it much more difficult for them to have been so widely collected. The W600’s also were an obvious source of advertising and distributed across the entire US via mail, all additional characteristics in their favor as compared to other oversize issues of the era.