Antique Enamel Art Nouveau Lucky Horseshoe Miniature Photograph Photo Frame

This little frame is true quality and beatifully made, the hinges are perfect , it opens to reveal a photograph of a long gone loved one, a son or a husband. This is the original photograph that has always been in it.

It is tiny at 1" in height when closed, and 0.75 across.

There is a little little scuff on each side of the enamel, please see close up photos.

There seems to be a letter M at the top of each side, my family  name was May, so this is possible or it could just be decoration.