Please amplify your comments in both posts; you're still not being clear, at least to me.
My response above was based on my own stamps which have the foil at the bottom of each stamp, not at the top.
We're talking specifically about the "3" of "43" missing part
of the top part of that numeral on each stamp of the inscription block. Here is the detail from the upper right stamp with missing parts indicated:
countyboy01 apologized for it being hard to see, but that's more a fault of the stamp color. Most any device you may have should enlarge the image if needed.
One has the foil also on the top of C and 3...
Nobody has mentioned the "C" until you have in your last post. How is this relevant to the discussion, please?
..., so which of the three shown possibilities is correct?
If by "correct" you mean "normal", then the two latest posts show that. There are not three possibilities presented. The OP already acknowledged that the inscription block lettering "CANADA 43" was different from the norm.