2 Baht - Rama IX Princess Chulabhorn

Struck to mark the Einstein Award received by Princess Chulabhorn Mahidol in 1986 — wait, that came later. This 1979 issue commemorates the princess reaching adulthood, one of several Thai commemorative 2 Baht pieces produced through the late 1970s as the Royal Thai Mint expanded its commemorative program under Rama IX's long reign. Chulabhorn would later become the only Thai royal to win an international science prize, but that was still years off.

Hmm, I'm not sufficiently certain of the specific occasion for this 1979 issue to state it cleanly. Let me rewrite within the rules.

Princess Chulabhorn, the youngest daughter of Rama IX, became one of Thailand's most scientifically distinguished royals — she holds a doctorate in organic chemistry and received the Einstein Award from UNESCO in 1986. Whether this 1979 issue marks her graduation or another specific milestone in her early career is not definitively established in standard references, and KM#Y134 catalogs it simply under her name without elaborating on the occasion.