Hi ,
The glasses I have seen before with polished bases to stand have definitely been etched with the cost of the contents , same as today people wanted to know that they were getting what they paid for , 1 pence worth 2 pence worth etc , the glasses would have been supplied by the drinks wholeseller and if there was a price review then replacements would have been sold to the outlets to comply with the latest measures and costs,just like the pint pots we used to have with a line for the measure being replaced for those without ,to be filled to the top, all good marketing methinks.
Cheers ,
Peter.