The mintage lines are locked so I can't use a standard edit to request a new line.
I have pending requests to edit that coin – adding Schön and moving the die letters from the mintage line comment fields to the Other marks field.
I created a post requesting information on what the die letters are on my coin and AD was the consensus.
The discussion: https://en.numista.com/forum/topic136117.html
The original post is copied below.
The Numista entry for Isle of Man 2 Pence 1990 only lists die letters AA. What happened with this coin? Is it a blundered AA, a blundered AD, or something else?
Close-ups of the die letters with lighting from four directions:
