What does this marking mean? How old are bottles with this marking

Rubenator

Tenderfoot
Jan 17, 2023
8
6
Detector(s) used
Garrett ACE 300i
XP DEUS
Primary Interest:
All Treasure Hunting
Hello everyone,

I have noticed that quite a lot of the glass I find has some marking on it, can you help me to know what explains this and what this mark means? So the marking is always something with CB, C I B, CB I, CB2 or C 2 B. The glass is always found in Belgium, but there is also French glass in between.

Thank you in advance.
 

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