1 Pound - Elizabeth II 4th portrait

Could somebody help me to understand the meanings of Position A and B of the above?

Many Thanks
Giuseppe
 

https://en.numista.com/catalogue/pieces5630.html

  I think it is for those who collect whether the edge lettering is upright or not. If the coin is flat on a table and face (obverse) uppermost, then A is where the edge lettering is also the right way up. So B is when the lettering is upside down (head side still on top).
 Just random which is which, as they have the edge made first, then the obverse and reverse pressed, I read on a different topic on here.

Many thanks ZacUK for your help.
Giuseppe

added a Note to the sheet now