500 Baht - Rama IX Reign

Pick 100 belongs to the 13th series of Thai banknotes, introduced under the authority of the Bank of Thailand's own printing works — one of relatively few central banks in Southeast Asia to have operated an in-house facility capable of producing the full note, rather than contracting abroad. By the mid-1990s the facility had accumulated enough technical depth to incorporate security threads meeting international standards without foreign assistance.

The 500 Baht denomination carried serious weight during the 1997 Asian financial crisis, when baht-denominated notes of this value were being hoarded as the currency collapsed roughly 50% against the dollar between July and December of that year. Notes from this series remained legal tender throughout the crisis and its aftermath.