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Here's an IBM punch card that was used in the 1960s to program computers: Here's a 1961 postal money order whose design was based on the IBM punch card: Now, here's the 1963 Hidell money order: Notice anything missing from the Hidell money order? (Or rather, not missing?) Hint: Ask Chris Newton. EDIT: I no longer believe this to be an issue. Post-1962 cards no longer used the cut-corner feature. See post 41 on page 3.