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The coin with the closed 9 has thicker text and mint mark compared to the coin with open 9.
Yes, well observed, and I knew that, but the main thing is the 9, right? You don't need to have another coin next to determine the difference, hence the accent on the 9 only. Quite often you have many differences next to the important one, but not to disturb anybody, please concentrate on the important and easily seen difference!
Globetrotter
Coin varieties in French:
https://monnaiesetvarietes.numista.com
