Antique Glass Syringe with Wound-Thread Piston, 19th Century Medical Syringe

A glass-barrelled medical syringe with red collar and drawn glass tip, the piston packed with wound thread. Before rubber washers the glass piston was wrapped with thread to seal it against the barrel, repacked by the physician as it wore, and the whole syringe went into the boiler between patients. A clean example with good clarity and honest age.