Modern Ancient Coin, Last Afghanistan Hammered Copper Coinage ?

I wanted a recent issue of civil coinage of the same kind as the early fals. I saw an attractive one recently on sale and got it.

The seller identified it is from Afghanistan, 1904. Should be depicting the blue mosque of Mazar e Sharif.

The date reads to me as 1322, so 1904 was correct. That puts it in the time of Habibullah Khan.
But what denomination is this? What kind of coin?

I found a near match here: https://en.numista.com/catalogue/pieces68050.html
But mine weights

There are copper coins of Afghanistan called paisa. Is this one of those?

Should I try to clear the reverse a bit or safer to leave it as it is? Copper coins are so at risk of corrosion.