Guernsey 1 Double 1830 - Striking error or die flaw?

[David Hill]

I don't know enough about the striking process to say whether this variety is a one-off striking error or a consistent die flaw. Unlike the 'dot before date' variety, I have never come across this before. 

[Peckris 2]

To answer the question, you'd have to survey as many of that date as you can, and see if there are any other specimens?

[Mr T]

Most likely consistent, due to a damaged die.