I was just going through some proof sets that I recently purchased, including a 1983 set I picked up at a local coin shop for $5. While I didn't see it at all when I purchased it, I just noticed that it's one of the rare sets with the S mintmark missing from the dime, to my amazement. Check out the photos below.
I'm not really an error coin collector, and I know this coin is worth some money. The Greysheet has this proof set set at an ask price of $875 and the PCGS prices for the dime alone range from $850 to $1750, depending on grade. I'm very excited about this find, to say the least.
I'd like to sell the set or the coin individually and use the proceeds to buy other coins I really want. So I'm looking for advice on the best way to go about this. Should I keep the proof set whole and try to sell the whole set (still in its original mint packaging)? Should I submit the coin for grading? Any opinions on what the grade might be from the photos below? I've been buying mainly mint and proof sets, and I haven't gotten into grading much yet. This is also the first valuable coin I've had that I'd like to sell, so any advice on this would be greatly appreciated.
Thanks,
Kris