This is a set of Thai new banknotes, issued upon the ascension of the new king Maha Vajiralongkorn (King Rama X).  The 20 baht note is a polymer note issued in 2022. The paper 50 baht note was issued in 2018. 

Front

The portrait of His Majesty King Maha Vajiralongkorn Phra Vajiraklaochaoyuhua in the Royal Thai Air Force uniform.

20 baht Back

The portraits of His Majesty King Phra Buddha Yodfa Chulalok (King Rama I) and His Majesty King Phra Buddha Lertla Naphalai (King Rama II).

50 baht Back

The portraits of His Majesty King Nang Klao (King Rama III) and His Majesty King Mongkut (King Rama IV).