The First photo had it's background removed which is why the details in the open work look very messy

The open work is not damaged

Enamel & Marcasite Victorian Monogram or Mourning
Several Marcasites are missing We believe it to be "MCWV" which would match a family member's initials including maiden and married names and would put this at the turn of the last century. She married a handsome New York Banker and they are the ones who amassed the early pieces in this estate.