Nice to see a clear signature, thanks.
Not sure if the chip can be polished out.... if there is a glass artist near you, it might be worth taking it along to see if they think it is possible. This is a good piece so is worth asking.
When you have a moment, can you show the limited edition number on the base, it should be opposite side to the signature.
On the Home page here, there is a thread to help you with sizing your pictures... do have a look, it is very helpful. You are aiming to get around 600pixels on the longest side.
Once you have got the hang of doing this, it will hold you in good stead for other times when you have questions you need help with.