France (1800-1825) data is correct?

Good morning. I want to ask administrators and users. How do you check the accuracy of the information coin? I mean the correct data coin, mintage, composition and size of a coin. I've got doubts about some coins and I want to know who added the coins of 19th century France.
Thanks.

Hello limbocoins,
We use many sources, varying from numismatics catalogs to measurements on actual coins.
Can you please tell which coin sheets are suspicious, so we can check?

5 francs 1818 B Louis XVIII
Mintage is correct? (1,119)
Thanks for help

hi limbocoins
5F  mint mark: B ( city ROUEN)  date: 1818    mintage: 2.190        KM# 711.2
5F  mint mark: BB (city STRASBOUR)   date 1818  mintage: 1.119  KM# 711.3
source: standard catalog of WORLD COINS 1801-1900  Edition 3
friendly
ludovic

Thanks!