Argentina 100 Pesos 1981 km85a - Fake coin or not?

Weeks ago I came across with the following coin from Argentina, which was supposed to be km85a 100 Pesos.



When you look at the edge is like an iron or steel core with two outer yellow metal layers.
This piece is magnetic.

Someone having the same km85a coin, could you please confirm whether this is a real thing or just a fake issue.

Thanks to all for your collaboration.

It should be magnetic: steel between layers of brass
I do not see any reason why such a cheap coin would be forged.
https://en.numista.com/catalogue/pieces8117.html

Missing edge clad layer maybe?

yo tengo una pero no es dorada es totalmente de ese metal gris, es falsa? es magnética