2¢ Carmine Retouch
The lower left vertical line is retouched in two places: from about line 3 to leaf 4 and from the bottom of leaf 2 to the bottom of the numeral box.
Research notes:
The retouching of the vertical line of the left numeral box is quite striking.
There is a guide dot at the centre of the left frame. The bottom portion of a compass arc extends downward and outward from the guide dot.