This used to be one of my doubles but I think that Numista 'split' what used to be a single coin into two (magnetic and non-magnetic)
https://en.numista.com/catalogue/pieces53892.html
For some reason I am not able to add a personal comment! I tried the similar 50 francs coin from the same year and that one works.
Any solutions please?
Regards,
Scambigol
PS I think you should warn those who have a coin that gets 'split' in the database with an automatic message or something!