20 000 Reis - Miguel I Overprint on P#6 - John Prince Regent

When Dom Miguel seized the Portuguese throne in 1828 and had himself proclaimed absolute king, the Royal Treasury faced a practical problem: existing note stocks carried the image and titles of the liberal regime. The solution was a handstamp overprint, converting João VI-era Príncipe Regente notes into currency acceptable under Miguelist authority without the cost and delay of entirely new printing.

Overprint quality and placement vary considerably across surviving examples — the stamps were applied under rushed administrative conditions, and misaligned or partially struck impressions are common enough to be expected rather than exceptional.