
Apologies, we did not explain exactly what we meant be seeing the base. You need to take a pic from a slight angle, so that the light reflects off the surface of the base, so that we can see anything that might be there and its general appearance. (I've attached a pic of a mark on glass to show you what I mean.)
Glass is a nightmare to photograph well.
It's 3D and pics are 2D. Clear, cut stuff is the absolute worst.

Signatures on this sort of thing can be really tiny, and almost worked into the design. Keep peering around the body!