"LM" hallmark?

[smasher]

I recently came across this 1kg silver bar. That's "1000 gm", not "1000 KG", as it's stamped.

Anyway, I'm wondering what the "LM" hallmark refers to. Any ideas?

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• smasher
• Oct 11, 2018
• 1kg lm hallmark silver

"LM" 1kg silver bar.