Yes Rich- I’m from the Soundview/Classon Point area of the Bronx and we played “cracktop” the same as “costy”. The intent was not only to get other colors on your wooden top but to crack the other tops. I can see why “costy” would be a name for this, a walk to the store for another 15(small) or 25(large)cent top was part of the game. They gave you a string with a wooden button along with the top but we usually tied a sliding knot loop onto the finger. We could really whip those tops!! This game was as cool as it gets!!