20 C+M+B 14 is wriiten above the door of the chapel at the Kronsburg Cloister where we are staying near Zams, Austria.
We saw the same chalk written inscription above my husband's cousin's home in Germany. I asked her the significance of the numbers and letters and remember that she said something about a collection made by children on Epiphany (January 6-- the 12th day of Christmas). The notations were probably made to make sure no one else came by to "collect."
But I decided to Google this inscription, since the only part I could understand was the 14 (signifying 2014).
I found one site that explained that this chalk inscription signified a blessing on the home. No reference to a collection of any kind.