It is an interesting variety but not very prized by collectors. This series of three stamps was the first foray into bi-colour printing on stamps that
Canada Post made and there are many varieties of this misregistration of the black or brown.
One way to collect them is to see how many steps are showing at the base of the monument, I think I saw an
ebay listing that had 7 or 8 different ones.
Here is a pic I saved from
ebay of one with the black shifted in the upwards direction compared to yours shifted downwards. Note the top of the statue almost touching the arch and the steps free of the bottom brown outline.
