Here is a neat Bust Half Dollar which will adequately serve as the topic for my 500th post, LOL... The O-122 is easily identified by the long top serif in the word stat(E)s on the reverse. There are some other minor indicators like americ(A-A)rrow distance and obverse star placement in respect to the denticles.

Personally I'll use the reverse of the coin to get my initial (field) attribution. Then check all the other little ID charactistics when back in the LAB... ROTFLing


Take Care
Ben