This is an older English silver locket - no marking but I am sure the exterior is silver. There are no "gussets" inside. It's a thicker locket - 1/4 inch thick; with the bale 1 1/2 by 3/4 inch wide. Nicely engraved in the front.
Gender: Female, Age Group: Adult, Color: Silver, Size: 1 1/2 x 3/4 inch