P-309b EDISON Diaphragm for Diamond Disc Reproducer

P-309b EDISON Diaphragm for Diamond Disc Reproducer. Early reinforced design of recent manufacture, a SITKO product. Works like originals. Price is for one diaphragm. Diameter is 2 1/8 inches. These are nicer than shown in the photo.  [HINT:  P-309R has restored Edison DD diaphragms.]

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