German factory payment marke? [gelöst]

Hopefully someone can give a short history or long if you prefer.  25.2 mm, 2.8g, zinc(?)

It's a tool tag.
“In workshops and companies, all work equipment and tools must be labeled. This is where tool tags come into play. This makes it easy to assign and inventory the equipment and resources. Sequential numbering or color coding shows which tool or resource is involved or whether all tools are present.”

Some modern versions:

excellent, thank you