300 Baht - Rama IX Queen Sirikit

Issued to mark Queen Sirikit's 36th birthday in 1968, this coin was part of Thailand's broader mid-century program of commemorative gold issues tied to royal anniversaries — a practice that served diplomatic as much as numismatic purposes, with presentation pieces distributed through official channels rather than entering general commerce. Surviving examples in original condition are common relative to many Thai gold commemoratives, largely because most were preserved by recipients rather than spent.