Is This a Mule Coin?

Because, some claimed that it is.

Hi,

don't believe in “somebody”, neither KM, nor Numista!

On internet you can search for “2 annas 1939 mule” and you'll find some sites mentioning a “second” head. Now if one can believe those sites is another question.

Good luck

But what do you think, is mine a mule?

No, I don't think so. There are two different 2 anna coins in 1939, as shown here:

your coin seems to be a well used km541, that's all.

Finally, its estimated worth, in this condition?

Look it up in numista.