What does 2 of Date over 1 mean?

Question: In my 2010 Rotographic Collectors Coins GB Annual I keep coming across notes against coins as under:-

2 of date over 1

'3' below date etc,etc

I am not quite sure what the above mean exactly and what I should be looking for with my magnifying glass. Can you please advise?

My Answer: What you are describing refers to mint errors called Repunched Dates (RPD), Misplaced Dates (MPD), or Overdates (OD) in which, in your first example would mean that the coin has a 2 with a shadow of a 1 visible underneath.

I hope this helps.