sharpness of the details appears valid in the image. i think you're ok. rusty dies are an extremely common characterstic of gold, & being a softer metal, it tends to (1) show more readily and (2) the dies would hodl the defects longer. note that few nickel coins show such rust pits.
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peacockcoins
The 1853 was heavily counterfeited, don't know about the 1852-O.
Ray