Hi -
some thoughts:
Normally, the bottom of a vessel, cup, pitcher or mug is most protected against damage of all kinds. If you see an object otherwise in a good condition but the bottom is scratched, dented and mistreated, all marks overstruck and impossible to identify - then some bells should ring! How comes that only the bottom is in this bad condition? Now start thinking....
Here some examples of other more or less old vessels - see the difference?




Regards
Zolotnik