Might be original luster, it's hard to tell from the picture, if the coin exhibits 'cartwheel' luster when rotated or rocked from side to side, then it might be original or lightly dipped. Also I cannot tell how extensive the wear on Liberty's left breast shield is or the immediate area just below the eagle's neck feathers to see the telltale evidence of grayness indicating light rub or just a weak strike. I find the blemished area on the left breast to resemble light wear especially troublesome, so just going by the pictures alone it looks like an AU-58, although the coin probably does and should look much better in person!
