Argentina, 10 Centavos 1897/6?

I collect overdates, I have perhaps one "discovery piece". It's less common but possible; not all are documented.
What I've found is that many overdates have predictable diagnostics in terms of what's seen on the underlying digit.
On a 7/6 for example, you often see a remnant of the 6's curve because the downward stroke of the 7 doesn't cover much.
Here's a montage of recurring overdate markers--from my collection.

The way I scrutinise potential overdates--I'm looking for a mark that is best explained by an overdate.
For example, here's a Norway 1 øre from 1932. While this one isn't documented, the curved mark (black arrow) underneath the "3" is never seen on a 3 digit of this time, but does closely match the 2 punch. The additional marks underneath the "2"--while unclear--seem to bolster the idea of an overdate too. I've tentatively called this a 1932/29. The last 2 digits were added to dies from the Kongsberg mint at this time.

Nice work on the photos and outline overlays.
There's ample evidence to suggest it's a 1897/7.



Oh look--my 10000th post!