I did some looking into my 1999 SBA coin> The first picture shows two coins my coin and a different 1999. Compare these. The other picture shows a 1979 P narrow rim. Compare this picture with my coin (first picture). It think the mint pressed my coin with the original 1979 die not the modified die ( see Redbook).
A slight MAD. Obv die shifted toward 6:00 makes the rm narrower. Notice how at 12:00 it is wider than normal.