The date can be seen on the obverse, in the exat spot where the date is on the reverse. is this a common error?
It is fairly common. I have a couple examples of it. The variety is also documented in numista: https://en.numista.com/catalogue/pieces2822.html John
That's interesting. It certainly looks like a legitimate error coin. It wouldn't be a strikethrough, though- of that I am reasonably confident. A strikethrough is caused by some foreign object - debris on the die. Please add pictures of the whole coin if you can. Perhaps @paddyman98 can say what's going on here. At first I thought it might be a double-struck coin that was struck again over an already-struck coin. But that wouldn't account for the misplaced date being backwards. Clashed dies would, but that looks too prominent and not like clashes I'm accustomed to seeing. I'll defer to those with more experience.
Yes to Clash.. I answered earlier I believe I have seen other examples of this same Brazilian coin. It's a known Clash.
