50 Baht - Rama IX Posthumous, Princess Chulabhorn

Issued in 2017 following the death of King Bhumibol Adulyadej (Rama IX) in October 2016, this piece belongs to a wave of commemorative coinage released during the official one-year mourning period observed across Thailand. Princess Chulabhorn Walailak, the youngest of Rama IX's three daughters, holds the distinction of being the only Thai royal to have received a Nobel Prize — specifically the Nobel Peace Prize in 1986, awarded for her contributions to science through the Chulabhorn Research Institute.

The mourning period restricted public celebrations nationwide, and the mint's commemorative program during this interval served largely as an official record of the royal family.