50 Yuan National Currency

Taiwan's 1999 polymer 50 Yuan was part of a limited commemorative run testing plastic substrate technology — one of the earlier polymer issues from the Central Engraving and Printing Plant, which had no prior experience manufacturing polymer notes and sourced the substrate externally. The Bank of Taiwan, technically a provincial bank rather than a central bank, issued it under circumstances already complicated by the pending abolition of Taiwan Province's administrative functions in 1998, which left the bank's institutional status deliberately ambiguous.

The clear window placement doubled as the primary security anchor, with the hologram integrated into the same zone — an arrangement that proved harder to counterfeit than the older intaglio-only cotton paper notes of the same denomination.