Pitney bowes bottle. Pretty cool.

I can not find anything on how old this glass bottle is from Pitney Bowes. I found one other piece identical but other than that it’s as if it doesn’t exist. The owner of the other piece assumed it was used to moisten the sticky part of an envelope. It has a marble stuck inside of it making it seem as such. As for stamp boom covers, do any of there have any hidden reason as to why I should keel them? I think it’s so neat looking at them and feeling like I can look through time and feeling that I’m one of the few who has some of them. Are any of these hard to
Find? Or do I have the same ones most collectors have.