Colonial revival drum-body teapot -- coin silver

Made by Knight & Biddle, retailed by J.E. Caldwell & Co., both in Philadelphia, c1860 -- straight spout, ebony handle, engraved with leaves and banner on upper 1/3rd of body, on lid and around base; ball finial on lid; intertwined mono M C on side of body; 11-1/4" across handle and spout, 20 T oz. Excellent condition throughout.