2A3 Cunningham vs RCA/Cunningham -dual plates

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I have a NOS engraved base RCA/Cunningham dual plate 2a3. I've been trying to match it but the closest people seem to have is a plain Cunningham printed on the base.
Are these from the same era as the fabled engraved bases? Is there any difference in sonics?
TIA!

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Topic - 2A3 Cunningham vs RCA/Cunningham -dual plates - bte 10:45:39 08/30/05 (2)

Re: 2A3 Cunningham vs RCA/Cunningham -dual plates - Matts_ 20:02:41 08/30/05 (1)

Re: 2A3 Cunningham vs RCA/Cunningham -dual plates - bte 08:54:26 08/31/05 (0)

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