Hello,
I hope that you do not mind me being straightforward, but I have a fairly large Eterna collection, and believe that the dial on the one that you have shown is either a genuine replacement dial, or (more likely) a redial.
I say that for two main reasons. First, and like most other manufacturers, when Eterna used luminous material in the hands of a watch, the material would also typically be used on the dial as well. I cannot recall having ever owned, or even seen an original example that did not follow this rule. Perhaps there were a small number of exceptions, but I would need to see some other examples to be convinced.
Secondly, the easiest way to detect a possible lack of dial originality on a vintage watch is to note a clear disparity in condition with that of other parts of the watch. In the watch that you have shown, the hands have oxidized significantly, and so the the dial, in contrast, appears to be suspiciously well preserved. The crown is also a replacement, further adding to the dissonance of such a well-preserved dial.
Finally, as the eternal-matic movement was first introduced in 1948, the dial could not possibly have been original to an earlier watch. If the case or movement actually date to anytime earlier than 1948, then the possibility of dial originality can be completely ruled out.
Regards,
Tony C.
This message has been edited by Tony C. on 2016-05-10 14:16:34