Identification First Stamps Brazil

Good morning to the whole forum
I have these three stamps from Brazil, I checked the various sites online to understand if they could be originals or common fakes, as I recently became an expert on this issue in my opinion they should be original, all three have gum on the reverse, but I always have some If I have any doubts about this issue, I'll leave an evaluation to those who are more experienced. Thank you very much Simone

Unfortunately these are all fake.

https://classiclatinamerica.com/wp-...mpressed.pdf

Rodgcam, Thank you for the great reference. I have bookmarked it for future use.

All 3 look genuine to me.
Nice condition also
Below some indications of the 30 with a genuine on the left.Yours on the right..
These are just a few concordances.There are many different for all 3 values.
The different printings can show different spots,breaks,faded areas..

They look good to me as well, though I'm most concerned by the 60r... If it's a fake than it's a quite good one.