Photo of a coin sold by NumisCorner, link to the sale and their website: https://www.numiscorner.com/products/france-100-francs-1986-km-p972-ms60-62-silver-gadoury-901p-29-98.
|N°||Année||Atelier||Tirage||F||VF||XF 40||AU 58||MS 63||MS 65|
'' --- '' as mentioned for all common silver coins: value by weight. Melted coins overwhelmingly, holes to create jewels. I think there will be a capital gain in many years, given the number of coins destroyed each year.