Hi, welcome to the GMB.
It is best to show photos that are at least 400 pixels wide.
Although I cannot see the exact detail of what you say is a "mark", I am reasonably sure that it is a "date cane", but in this example it seems to have lost a digit. It looks like "185" but a larger photo would comfirm.
Anyway, the weight was made in Murano, early to mid 20th century and contains a false date cane. Lots of these were made, possibly with the dates being whatever people asked for. Usually the dates were "18xx", which leads some people these days to think the weights were 19th century, They are not.