Morgan dollar collector's question

I inherited 20 1921 Morgan dollars, mintmarks are 7-P's, 6-D's and 7-S's. I think all are circulated, some better than others. I don't collect Morgans so I know very little about them.
My questions are - are they worth my time posting them to Ebay? Sell them for melt?
Any varieties I should look for? Any help is appreciated.
Here is a photo of one of the better coins.

My questions are - are they worth my time posting them to Ebay? Sell them for melt?
Any varieties I should look for? Any help is appreciated.
Here is a photo of one of the better coins.


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Comments
For the D MMs, look for most any die break.
For the P MMs, check for pitted reverses.
These are only a few. Some are worth lots of money, others are not.
Check out Rob's website at www.rjrc.com and click on VAM Identification Help. Scroll down to the 1921D link and the thornhead link as well as the pitted reverse link.
These will be good starting places.
edit to add
Only after examining them with a ten X magnifier for VAMS and die cracks.
Some 21-P, 21-D, and 21-S varities are selling for very high premiums. It's worth time to review "common coins".
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John
Keeper of the VAM Catalog • Professional Coin Imaging • Prime Number Set • World Coins in Early America • British Trade Dollars • Variety Attribution
Now it looks like I have some homework to do