I found a bottle in the roots of a tree

The bottle has 3iv on it and B 4 on the bottom can you tell me what the B 4 means.

The B 4 markings are likely manufacturer marks... things like mold number, etc.

Chris
The B 4 markings are likely manufacturer marks... things like mold number, etc.

What does the B 4 mean I can't find anyone who has one with that marking or what the markings mean. Can you help? What year was it made? Where?

I have tried to find that markings but can't. Can you help me? The most I have found is that it is a date but can't find any information on the B 4

Where can I fine what manufacturing marks mean? where was it made? and when?