600 Baht - Rama IX 6th Asean Orchid Congress

The 6th ASEAN Orchid Congress was held in Bangkok in 1986, a fitting venue given Thailand's position as one of the world's dominant orchid exporters and the country's deep botanical tradition tied to royal patronage. Commemorative issues of this type were produced in limited runs for collector markets rather than general circulation, and Rama IX's reign saw an unusually high volume of such silver commemoratives — a pattern that has made individual issues harder to price with confidence as secondary market demand has remained uneven.