Elsa

I have recently found this site - specifically this post - whilst researching a brass dish I have. The impression is of the Seal in absence of the Grand Seal of Charles V 'le sage' of France. I have learned that the impression at the University of Notre Dame is dated 1376. I am curious as to how such an item could have been pressed and could this have been done indirectly from a wax impression. I also understand that tradition at the time was to donate second/third royal seals to the 'Sisters', a charitable organisation. Any idea how I might date the dish? I assume it is relatively modern. The impression has the same diameter as the impression at the Hesburgh Library. I did email them, twice, to ask where the original seal matrix is but have had no reply. I was hoping, at the very least, to be told this is a relatively modern souvenir, comon in France. The dish looks old and may not be a single piece of brass. Any help on who else may be able to assist would be much appreciated. I