In the world war 2 period, there were many banknotes that were issued for any occasions. Their different apperance were not fit into any series so they were classified as special series.
50 Satang (1946)
1 Baht (Kong tek) (1942)
1 Baht (Invasion notes) (1946)
50 Baht (Mourning notes) (1945)
1000 Baht (19xx - 19xx)