Photo of a coin sold by NumisCorner, link to the sale and their website:
|N°||Année||Tirage||G||F||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.