Should I Have This Coined Professionally Restored And Graded

The most I would do with it would be to soak it in distilled water to saturate the dirt. Let it float off; DON'T rub it, or you scratch it and ruin its value. Leave it as "natural" as possible.

Restore it? No such thing. You might as well rub it with Brasso and steel wool. ANY rubbing will ruin it.

The cleaning methods given on that mD forum are find if you are just removing corrosion and junk from pocket change so you can spend it, but for anything that may have numismatic value their methods are pretty much guaranteed to destroy any value they might have. (They have a real fascination for rock tumblers and gravel)

there are different methods for differnt types of finds. tumblers for clad coins to be dumped into a coinstar. that's obviouslly not pertinent, however for numismatic finds they have a decending list of methods starting from the least intrusive (deionized water baths). The important bit though is not to send your dug coins to ncs as they do not insure their work and don't specialize in dug coins.

Here's what I'd do were it mine and I'd spend several weeks doing it...

1. Distilled water soaks. Key word being Distilled. Place the coin in distilled water. Change out the water on a dailyish basis. When changing out the water look the coin over. I would not rub it as minerals still on the coin could scratch it. But if there is loose debris waiting to fall off I might try to dislodge it with a toothpick which has been completely soaked in water.

2. Acetone bath. Drop the coin into an acetone bath for 5ish minutes. Rinse with water

3. I'd repeat step one and two for as long as I was still achieving results. For encrustation inside lettering a slightly less soaked toothpick might be used.

4. Once deciding the distilled water baths aren't working any more I'd turn on the oven to 175 degrees. Place the coin in between the folds of a rag and warm it up. I'm just drying the coin out trying to get the moisture off of it. 175 degrees is a common temp for exposed metal to reach in sunny conditions. No more than a couple of minutes of this and then it's out of the oven. Moisture in the presence of oxygen is detrimental to copper.

5. There are a couple more possible steps after this but I think they'd be better left unsaid here. Regardless I'd spend SEVERAL weeks on these 4 steps. I think you'll be amazed at the results.

If you go this route be sure to take before after and during pictures.