Spain pirate cob ? [решено]

hi any help would be gratefully accepted in the identification of this coin. 20mm x 22mm 3 g [bought as pirate cob 8 maravedis colonial coin Phillip IV 1630-1639].

Obverse: part of a castle,163,x16,III

Is philip IV 1636

Countermarked Crowned VI and mintmark on 2 maravedis 1506-1602

N#117839

thanks for the help much apricated Pimmy