2¢ Carmine 6LR71
A distinctive retouch of the vertical line of the left numeral box.
Comments
Confirmed by LB using the plate proofs at LAC.
Leo's Notes
The bottom half of left vertical line of the LNB is thick; however, the left and bottom lines are very faint at the LL corner.
The LL corner of the bottom frame has a gap on the left outer edge as though the left frame stopped short of the bottom.
Smudge in the UR corner of the third A in CANADA.