Old postmarked postcards can vary in value depending upon their content, to whom they are addressed, the picture on the front, etc. If a postcard is in good condition and contains really interesting content, it may be worth it to have the postcard appraised by a professional.
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The value is going to require a lot more information. The post card rate was 1 cent for over 50 years. Consult a stamp catalog, look under postal stationary and narrow it down to a specific card. The catalog will provide an estimate of value in perfect condition.
Many of the postcards dated from 1915 are valued at a price close to $10 to $20 each. The exact price will depend upon the actual postcard and if it was sent through the mail to someone.