In use since at least 1941
Blazon: Argent two vines* intertwined vert, in the dexter chief an escutcheon sable a lion rampant double-queued or langued and crowned gules, in the sinister chief an escutcheon fusilly in bend azure and argent
The vine motif seems to be extremely old, possibly dating back to 1331 or even earlier. It remains consistent across many different versions of the arms. The escutcheons in the chief are probably derived from the arms of the Electoral Palatinate. The lion was the symbol of the County Palatine. The argent and azure fusils originally belonged to the Counts of Bogen, but were adopted by the House of Wittelsbach in 1247, and are often used for Bavaria.
*I have not had any luck identifying the specific types of vines shown here. Most depictions of the arms do go out of their way to distinguish between the dexter and sinister vines, which is a good indication that they are intended to be different, but I cannot determine the exact species.