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This topic was posted in the フランス語 forum.

La variation de forme irrégulière peut influer sur le poids de la pièce

 

BOINC

That delta in weight is incredible small and inside the “normal” allowed tolerance, and for a hammered coin the tolerance is probably bigger than for a modern, issued coin!

 

Here are the measurements of the 5 centimes, km933, from my collection 5% deviation in weight is what I found!

Globetrotter
Coin varieties in French:
https://monnaiesetvarietes.numista.com

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