500 Francs overprint

This note began life as a standard Banque du Congo Belge / Banque d'Émission du Rwanda et du Burundi issue, later overprinted for exclusive Burundian use following the separation of the Rwanda-Burundi monetary zone. The 1964–1966 period saw Burundi scrambling to assert independent monetary infrastructure after the colonial currency arrangements collapsed, and overprinted transitional notes were the practical stopgap while new designs were commissioned from De La Rue.

The overprint itself is the entire story here — it transforms an earlier regional note into a sovereign Burundian instrument without new engraving or design expenditure. Worth confirming the overprint is crisp and correctly registered; misaligned strikes are known on this series.