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40-Year Calander Comp, Brass – CO031
An early, simple pocket calculator from an era when 40 years were akin to perpetual. Its origin goes back some 500 years. Calculate the day of the week for any given future date, within a 40-year span. To use, simply rotate dial until the selected year lines up with the selected month. Locate the particular date and find the day of the week above it.
