
Don't worry. Signatures
are cans of worms. Especially so on Mdina or IoWSG.
It is fairly common knowledge that Michael Harris rarely signed things - so things which have genuine marks on can raise very high prices, (paid by folk who want these marks on the bottom of their glass) this in turn leads to unscrupulous people faking signatures on pieces which might not be expected to have them - such as your bottle.
The opinion appears to be that your signature is genuine, but we don't know why it is there.
It's just a nice little bonus for you.
