Singular coin

This is the only one of this coin I have seen

Yes, you already told us.  Care to expand on what you mean?

https://en.numista.com/forum/topic146500.html

There is only  of this coin on the internet there are no other references 

So what? There are at least two paper references Yeoman and Krause Mishler (albeit using Yeoman's listing).

Do you have this coin?

I can mention some coins I have never seen.

There are two coins on the coin page, one of which was uploaded by the OP.

numista rarity index of 85, other people seem to have it atleast

Koci sells one takka of kotah princely state for 20 EUR.

They got other two round shaped and locals can probably identify them.

Now I understand, we have now for every coin in the catalog in the end of the page a button “discuss or ask a question”, when you click there, an automatic thread starts here, probably OP just wanted to say that was the only one he saw. Common practice for example on Zeno.ru

That's explain some meaningless new threads.