Vintage Mercury Glass Concave Christmas Ornaments in Blue Set of 2

1960's, mercury glass mini's. These are in pretty rough shape and price reflects that. One of the ornaments has some kind of "powdered snow" over the blue stripe and it is coming off when it's handled. A spray of polyurethane may fix it. I think these are in decent enough shape to be used on a tree, however, they may be a better fit for a wreath project. Please look at photos carefully and ask questions.