The first four coins thay you picture are 4 Maravedis pieces. I have not seen a 2 Maravedis piece and am aware only of the devalued 4 described below. Your sixth coin bears a resemblance to a "Lion & Castle" 8 Maravedis stated to be from the 1640's, currently on EBay. The image I have included is of three 4 Maravedis coins of Caroleus et Ioanna circa 1535, a part of a hoard unearthed in the Domincian Republic by Hurricane Cleo on 08/04/1964. I obtained them in 1965 from the dealer who went there and brought back all but those that were retained by the government for museum display. The obverse shows the Inscription, CAROLEUS ET IOANNA", a crowned "Y" with "E4" (called Type II) or "FIIII" (Type I). The third coin is an E4 that has been counterstamped with a key that has a diamond shaped head devaluing it to 2 Maravedis. You can see the diamond shape of the key on the reverse of the "Key" just below the crack at the top. Only 25 of the "Key" pieces were found in the hoard. The reverse has the inscription, "REGIS ISPANIARUM ET INDIARUM" around the rim and depicts the crowned Pillars of Hercules with the letters "S" and "P" respectively to the left and right.