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Is it worth it? 1894 O Morgan

I recently picked up this Morgan with several other silver coins for less than melt. I was glad when I saw the date and the mint mark... but then I saw the gunk on it. 
Couple of questions:
1. From what you can see of the coin, what would you grade it?
2. Do you think it would even slab (assuming there was no gunk on it)?
3. What do you think it is on there? It looks kind of like gum to me, but it is hard. There are some spots that feel soft though.
4. Do you think I could get this gunk off?
5. Do you think NCS could get it off? Would it be worth it to send it into NCS?
6. How would YOU try to get it off and preserve the coin?
This stuff is on several of the coins I got with the lot.
Morgan:

Walker w/ gunk:


Couple of questions:
1. From what you can see of the coin, what would you grade it?
2. Do you think it would even slab (assuming there was no gunk on it)?
3. What do you think it is on there? It looks kind of like gum to me, but it is hard. There are some spots that feel soft though.
4. Do you think I could get this gunk off?
5. Do you think NCS could get it off? Would it be worth it to send it into NCS?
6. How would YOU try to get it off and preserve the coin?
This stuff is on several of the coins I got with the lot.
Morgan:

Walker w/ gunk:

Buying £2 Britannias
0
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Puro's Coins and Jewelry
Rutland, VT
(802)773-3883
Link to my website www.vtcoins.com
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Buy, sell and trade all coins, US paper money, jewelry, diamonds and anything made of gold, silver or platinum.
Grade? I dunno; VF? I won't give it a number for I believe the surface looks wierd and it won't slab.
This is a pretty common coin and I don't think it is worth the efforts of NCS.
An acetone soak should remove it. What you find underneath that gunk will probably also be a disturbingly different surface. And then you'll be tempted to dip the whole thing to get a consistent color. Then you have a worn dipped coin. Ack!
Revolting pictures. Someone with a bad flu sneezed on those coins.
2) In order to provide a grade estimate, a reverse pic is required.
I'm just wondering how long is too long?
It should attack and soften that goo rapidly, within tens of seconds. Leave it in for 10 minutes and see what happens. Let the acetone do the work; you do not want to use mechanical force on a coin or you will scratch it. There is no harm in letting it sit.