Vintage Regency filigree marcasite band watch

This watch is beautiful! Gold tone marcasite filigree band. Gold face. Fold over clasp. Not sure if the working condition as I believe it needs a battery. I can’t take the back off to test. ** has a slight imperfection on the side of the face. Not sure what it is. It’s smooth to the touch. Unnoticeable unless it’s turned a specific way (see pic). 7 3/4”