500 Baht

P#138 is the sixth series 500 Baht note, issued under the reign of King Vajiralongkorn following his formal coronation period — a transitional moment that required retiring the long-running fifth series notes bearing his father Bhumibol Adulyadej's image. The Bank of Thailand Note Printing Works has produced Thai currency domestically since 1969, and this note falls squarely within that self-sufficient production framework, printed entirely in Bangkok without foreign contract involvement.

The security specification here is relatively modest for a high-denomination note of this period — watermark and thread only, without the polymer substrate or more layered optical features appearing on contemporaneous issues from neighboring central banks.