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With the exception of some very late issues (Han period), none have inner or outer rims.They appear to have been cast in reusable carved stone (steatite) molds, several of which still exist today.
While specimens of this larger issue weighing over and under 12 grams probably date to the same period, many collectors value the heavier specimens more highly. Specimens over 12 grams exist and command a premium price, but they are rare.
While the AVERAGE weight of an issue is closely tied to the diameter, the weights of individual specimens can vary so much (up to 200%) as to be almost meaningless (see our earlier discussion of weights).
Unfortunately, not enough dateable hoard or archeological evidence currently exists to work out the exact classification of the Pan Liang series, but the Records of Han provide a clue, stating that heavy Pan Liang were cast until about 187 BC.
The official records of Han suggest that the coins of this size were made continuously throughout the later Chin and early Han periods, and one probably cannot assign them specifically to one Dynasty or the other.
Pan Liangs under 30 mm can safely be assigned to the Western Han Dynasty and are discussed under that heading.