Isle of Man Christmas 50p 2000 with no die marks

Hi, first time posting so I hope this is OK.

The listing for this coin only has the coin with BB as a die mark but I have examples with no die mark.
http://s25.postimg.org/ohvtstt8f/2014_05_27_20_44_17.jpg

Cannot find any other reference to this coin without the BB die mark but I have 2 copies now.

  Welcome to the forum.  

https://en.numista.com/catalogue/pieces19886.html
 I added separate line with 'no letters' so you can enter it. Where should they be - is it to the right of the book on the table ? Have you some close-up pictures ?

Hi, thanks for that.
Yeah they are normally on the right, beside the book.
Here's a picture of the coin with the die mark.