Antique Vintage Crystal Cut Glass Silver Plated Biscuit Box English Seahorse

Antique Vintage Crystal Cut Glass Silver Plated Biscuit Box English Winged Sea Horse/Dragon. We could not find any makers marks or stamps. There is a missing Nut on the bottom, see photos. We had the Winges Sea Horse/Dragon Tested at a jewelers and they said it was silver but not sterling, silver plated. Please reach out with any questions.