The 1957 Proof Franklin Half Dollar is fairly common for a proof coin. In PR60 to about PR67 it is easy and inexpensive to obtain. In PR68 it becomes much scarcer and worth a significantly higher premium than PR67 examples. When displaying Cameo surfaces it is obviously scarcer than non Cameo examples. With enough searching a Cameo example can be purchased inexpensively up to about PR67 grade. Examples displaying Deep Cameo surfaces are very scarce with less than a few hundred examples known in all grades combined.