[Phono-L] Edison electrical DDs

[Aph4990]

I have recently bought a bunch of Edison DDs of the 52000 series.  The  
original owner just died and these were in his estate sale.  The are  
absolutely pristine and sound great.  I know that Edison started  electrically 
recording these somewhere about July 1927,  But can  someone give me the number 
of 
the first electrically recorded diamond  disc?
Thanks,  Art Heller
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