[78-L] RCA matrix coding - date

[Royal Pemberton]

The first system was used from 1942 to 1955 (or end of 1954?), the second
one 1955 to approximately 1962, the third from then on until approximately
1973.

On Sun, Nov 2, 2014 at 12:45 AM, Thomas Stern <sternth at attglobal.net.invalid
> wrote:

>
> When did the matrix prefix codes on RCA pressings
>
> using a letter to indicate date begin ???
>
> Was it 1950 "A"
>
> Most writeups about this start at 1955 "F"  ...
>
> Thanks!
>
> Thomas.
>
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