1 Dollar - Elizabeth II Princess Diana in Thailand, with "IRB"

Issued under Cook Islands' long-running commemorative licensing program, which has produced hundreds of portrait coins bearing foreign royals, celebrities, and historical figures with minimal connection to the islands themselves. The "IRB" privy mark identifies this as distributed through a specific retail or collector channel — the initials likely denoting an issuing or retail body, though Cook Islands output from this period was so prolific that individual privy mark attributions are inconsistently documented.

Diana's 1988 visit to Thailand was part of a broader official tour of Southeast Asia.