1682 over 1 Crown of Charles II with QURRTO edge error. Some reverse adjustment marks.
The overdate has only the feintest trace but the QUARTO over TERTIO is very clear.
Obverse; Fourth bust. Reverse; Crowned cruciform shields, interlinked C's in angles. Composition; 0.925 silver.
ESC 65B. Listed as Rarity 2 by Rayner (very rare).