Help with identification of antique gold coin

Can anyone help me figure out what this coin is.
Judging by cross it should be Spanish. But I can't find anything that looks like it.
Weight is 3.8 gram.
And diameter around 10mm.

 

found this 1768 Potosi. Similar in some respects. But weight of this is a lot more than yours.

 

Simular but not the same. There are tons of similar coins from this era but none match in weight and size.

 

The photos are not in focus,but the coin seems to have casting bubbles which would make it a fake/replica.

 

First of all, I am not good at numismatic.
I think it probably a spanish gold circulated in ancient Peru? The pattern looks similar but not exactly the same. Further, your coin looks very shinny and not dark enough for an antique coin, probably because of the polish???

 

Need experts show up to explain.
Not much I can do.....

 

I turned your coin the right way:


Those castles and lions (symbols of Castile and Léon) look very strange.
@daveydempsey will probably know more.