40 Year Calander Comp Brass CO031
40 Year Calander Comp Brass CO031. An excellent early and simple pocket calculator from a time when 40 years were like perpetual. Its origin dates back about 500 years. Calculate the day of the week for any given future date, 40 years from now. To use it, simply turn the dial until the selected year lines up with the selected month. Look for the particular date and look for the day of the week above it. Brass.
40 Year Calander Comp Brass CO031. An excellent early and simple pocket calculator from a time when 40 years were like perpetual. Its origin dates back about 500 years. Calculate the day of the week for any given future date, 40 years from now. To use it, simply turn the dial until the selected year lines up with the selected month. Look for the particular date and look for the day of the week above it. Brass.
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