First, I know this is not the correct forum for a 1929 20 Centavos coin from Argentina. Since there are likely to be more experienced eyes in this forum than others I thought I'd try here first. If the mods want to move the post I understand.
I'm not sure exactly what I'm seeing on this coin as it appears to have a little bit of everything. On the obverse I am seeing very clear strong doubling on Republica that diminishes as it goes towards the right.
By the time we get to the end of Argentina it looks almost like push doubling.
The date shows distortion similar to push doubling as well, but the 9's, especially the second one, appear to be doubled through non mechanical means.
There is very clear but faint doubling on the neck, chin and nose of the profile (not easily visible in the photos)
The Stars at the bottom looked almost smashed, rather than pushed or doubled on the die.
On the reverse, the wreath elements on the right hand side towards the rim show clear doubling, as does C, O & S of Centavos.
But it's the lower right edge that has me confused. There appears to be a clear brockage of the obverse Argentina running from K4 to K6, but it's under the correct wreath device, which appears to have been struck over top of it.
Is there such a thing as a double struck brockage? I read the error ref page on brockages and found a few similar descriptions, but nothing in the photos that looks like this.
Any diagnostic clues would be welcome.






