How much are these coins worth?

hey I have these two coins one is kind of a penny color but it looks worn so it could have been gold color there not round they look hand made and I think there spanish one is silverish and the other is goldish but there faded soo. the golg one is about the size of a nickel and the other a toonie the gold one is titled gold cob pistole pistole “bout Barre dor” everything is cappatalized and there are small flowers and leaves around themand on the other side looks like it had 2 cappital letter I’s crossing eachother then the rest isnt clear and the larger coin says eigth reales silver cob peso”bout barres dargent” and it has little dots along the rim with nice curvesand the other side is definantly a coat of arms I cannot make out what is on it I think there might bea dragon or a lion or sumthing like that and a crown but im not sure because theres a white chalky type stuff covering them from sitting neer chalk and the rim on this side is the same as the other side what is there value and what year are they??? also how do I get the chalk off