American, c.1920, intrauterine device, stamped 10K, 5.5cm long, in original card case with labels 'GOLD PESSARY 10K H CARSTENS MFG. CO. FOREST PARK ILL. SIZE SMALL 3/4 INCH DISK', to lid interior 'CAUTION: To be used only by or on the prescription of a physician. WARNING: This device will cause cervical irritation......its use should be discontinued at frequent intervals.....' etc