Z Narodzenia Pana dzien dzis wesoly!
when put into a translator this comes out:
The Nativity of the Lord's day merry today!
the sender wrote me that this is the first line of the Christmas Carol, so I'm thinking it might be 'Have Yourself a Merry Little Christmas'.
What ever it is, this is a wonderful Christmas postcard featuring baby Jesus, Mary and Joseph.
postmarked in 2012 with two Poland stamps.