Center medallions feature a classical scene of possibly Perseus holding the decapitated head of Medusa or, more likely, Judith displaying the head of Holofernes. Sconces were restored and one "tail" reattached 20 years ago. Used since to hold taper candles. Not familiar with E F Caldwell?
Try Google and discover the work of an early pioneer of electric lighting. Caldwell items were usually bespoke pieces, created for the wealthiest of the Gilded Age. The workmanship is without compare and found in the best homes (including the White House) and public building.