Nice 1625 unattrib. Spanish state 1 ardite, great research coin!

#2011-1334 in SB. When I purchased this in 2011, the seller indicated this was a coin of Spain, catalogue # KM21. This is not a Spain federal issue but a Spanish state issue such as the Principality of Catalonia. There's a Catalonian issue #31 which is similar, but after some research I could not learn more info. The obverse is a bust facing left, A to the left and R to the right. The reverse appears to be a shield but is actually a box turned on one corner, divided by a series of lines. Above is the year, heavily corroded, and CIVI (City) at bottom left.