This postcard is postmarked December 31st, 1913 from Murphysboro, Illinois and was sent by the parents of Charles Kepferer to his residence at 1117 N. 18th Street, St. Louis, Missouri. I wonder if they were used to writing the 1900 part.
From the back:
Dear Son: Write and tell us if you got your Christmas box. I wish you a Happy New Year. Your Father and Mother.
I wonder if he got his box.