50 Baht Polymer Banknote
They are similar in characteristics and size to 50-Baht banknote, 13th
Series, The differences lie in the fact that this type of banknote was
printed on a polymer substrate, and the Krajung design is replaced by
the Royal Crest in commemoration of the Golden Jubilee Celebration of
His Majesty's accession to the Throne. Source.