Gold coin. Spain ? Portugal ? [решено]

Hello dears. A friend of mine sent this coin picture.
He says it's very expensive and scarce coin.
Is it true? And what is it ?
Sorry for unperfect images. Weight 4,45 with additional trash

It's from Spain. 1 escudo of Juana and Carlos (1537-1556). Minted in Seville (my home city). 300-500€

It's not yet in Numista catalog.

Thank You very much !
So, it seems its not so scarce and expensive, - I guess any 1500-th gold coin worth so.

best
D