Early IoWSG signed bits tend to have the vibration. He must have managed to get hold of an electric pen before he left Mdina.

I've just noticed, you say this has just come up for sale? (I thought you'd already bought it)
Do you own the photographs? If not, do you have permission to post them here, from the owner?
If not, they will have to be removed for copyright reasons. The board is liable.
You are welcome to post a link to the sale, so that copyright does stay with the owner.