Hi,
Your coin is Spanish from c.1600, the type that was heavily countermarked and revalued (although yours seems to have avoided the over stamping). I can't see the date, denomination (possibly a 4 or 8 maravedis piece) or mintmark.
For some countermarked examples of these coins see my gallery here:
https://www.forumancientcoins.com/gallery/thumbnails.php?album=600.
A countermarked 1620's coin below, overstamped in the 1630's and 1640's from Madrid
(https://www.forumancientcoins.com/gallery/albums/userpics/11521/rjb_spain10_08_05.jpg)
Regards,
Mauseus