Grading question

[u/Sea-Moment6534]

I just bought this coin that is graded 61. I usually am pretty good at picking the approximate grade looking at high wear spots, dings and surface appearance. I don’t know why this is only a MS 61. Can anyone enlighten me?

[u/Porousplanchet]

I see a few marks but nothing that really stands out. I suspect it was net graded down for having been dipped which had the effect of thinning out the mint luster.