According to a press release dated 28 August 2020, the Banque Centrale des Comores introduced more robust 500- and 1,000-franc notes (B306c and B307c) on 1 September 2020. These notes are like the preceding paper issues, but printed on the Banque de France‘s EverFit composite substrate.
The bank also indicated that the 2,000-franc note (B308) “will soon be printed on more resistant and varnished paper.”
The revised notes will circulate in parallel with existing issues.
Courtesy of I.B. and Murtaza Abdeali (African Collectible).