This is a card wishing Herr Stoltz a Happy New year. It was postmarked on Christmas Day, 1910.
And here's the back of the card.
The handwriting is not so tidy, and it's that awful old German script, but I was able to make some of it:
Dear Friend I wish you a Happy New Year...We received your package with joy. Thank you for that....Greetings from Schweigert Henri.