I have no idea.
I have a very small goblet, also unsinged. And a plate I bought nearly 20 years ago, signed and I mistook it for Mdina - which is what it was listed as.
Several folk have muddled even properly signed bits with being Mdina.
I learned this design by experience (following much confusion) both inside and out. (the goblet has the pattern on the inside, not the outside.

)
I did know the letter I needed to start off with.
