Who was the designer of the Public Libraries Act 50p?

[Pavel]

Good day all.

I am now editing the UK / decimal part of my coin reference site and have reached the 2000 Public Libraries 50p; it's listed as having been designed by Mary Milner Dickens (that's what the Royal Mint site says). But, there seems to be a signature between the two right-most columns which is nothing like her signature on the EU 50p?

Would any of you have some insight on this?

 

[Nick]

Coins of England & the UK lists the reverse design as Mary Milner Dickens also.

[Unwilling Numismatist]

I suspect it is what Mary uses as a monogram for her work, it is also present on the Suffragette 50p, whereas her older work had the initials MMD.