A small oval lidded trinket box covered in glued-on seashells and lined in red felt.  The box measures 3 1/4" across, 2 3/8" wide, and 1 3/4" high.  The maker is unknown and the condition is very good, with no missing shells, stains, or repairs.

Coquillage Boxes

The french word for seashell is coquillage, and shell encrusted boxes are often referred to as coquillage boxes.