P-311a EDISON C/H Copper Diaphragm

P-311a EDISON C/H Copper Diaphragm, These are ORIGINAL used, cleaned C/H copper diaphragms.  [Photo shows how a NEW one looks.]  Diameter is 1.25″.  Concentric pressed circles may differ (my choice which you get); all have the center hook-up tab.

PLEASE NOTE: Due to extremely low quantity, sale is limited to ONE per customer.