Thanks for all the precious info, for the moment ill borrow a 1.5kg hammer and a steel base from a friend to give a try in the next days.

At this point considering your info im very hopeful that it will work.

Anyway, i'm still convinced that a press would be the easier way, but it would be way more expansive than the hammer.
After giving about 10 hammer hits i was already starting to feel tired LOL, so the press looked way way easier for somebody lazy as me aha.

I've seen some videos on youtube of people stamping with the press but they did on softer metals, and used a special tool to be attached to the press to hold the engravers in the right poisition.
I think a 2 tonn press would be fine but it costs about 150$, + the engraver holding tool that i wasn't able to find anywhere yet i'm sure wont be cheap as well..

So for the moment i give one last try with the bigger hammer.
But if btc reach 150k i promise myself i will buy the bigger press