Can anyone explain which version of the Mexico 2 centavos coin is which. And how to make difference between wide and narrow date ?

I see the explanation on the site but which one is the inverted date ? flat or 40 degrees ?
There is his extra explanation given : "Example of an "Inverted 6" variety (6 in date was first struck inverted and then a second strike with the correct alignment was made, but it is easy to appreciate the original inverted 6 under it, specially in the empty space between the top and the "belly" of the number):"
Sadly the second pic is too small but... if you can see the original inverted under, the 40 degrees should be the inverted version. Right ?
Also how make difference between wide and narrow date ?
Thx.





