These coins have been found in most parts of the subcontinent, except in the far south. Some types have a fairy-wide distribution, while others (such as those found at Ayodhya and Kaushambi, which seem to have been issued in the last 3rd or early 2nd centuries BCE) have a more restricted range of circulation. Kaushambi, uninscribed, cast copper unit Tree in railing in centre, wheel above nandipada to left, swastika above the Ujjaini symbol to right, and six peaked hills at the bottom. Rev: Lanki bull walking to left, four nandipadas above in front of triangular-headed standard. Bopearachchi & Pieper: These coins were made by melting metal and pouring it into clay or metal moulds.