1918-D Walking Liberty Half Dollar with NO monogram

[Dark]

Hey everyone.
Someone local is selling a 1918-D walking liberty with no AW monogram. It appears to be in Good condition. According to Breen's Encyclopidia, only 4 to 6 of these are known to exist.
The guy is asking $350.
I am considering purchasing it and getting it slabbed and then trying to sell it to a larger audience such as ebay and maybe make some money.
Is this a smart move?
Thanks in advance for any advice or comments!
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[Gunrunner61]

As P.T.Barnum said there's a sucker born every minute, And If it sounds too good to be true then it probably is jmho..................HH

 

[Dark]

I have many common date walkers and I could bring my scale to ensure the weight is within acceptable range.
Let's just assume this is the real deal. Do you think a profit could be made off of it?
I am having issues finding the value of this coin; presumably because of its rarity.

 

[l.cutler]

I am not familiar with this variety but I would do more research. Breen's encyclopedia is 25 years old so the information may be way out of date. The only coin of this variety I could find was slabbed ms61 and sold for $1,100, so I doubt one in only good condition would sell for much, especially if you had to recoup your slabbing cost. If this is not a recognized variety it would not be noted on the holder either, it would simply be slabbed as a 1918 d half in low grade.

 

[Dark]

Ok,
Thanks for the response.