I think the reason this one may go for well below market is that there is no picture that shows the "14K Solid Gold" hallmark on the outside of the case that you would expect to see in between the lugs. It would have been so simple for the seller to remove the band to show this. Seems a bit odd to me.
There really is no way to tell the difference between solid and gold-filled without that hallmark, or a view inside the caseback.
Seller has good feedback, so I'm reasonably confident that it is what they say it is. But still a gamble.
gatorcpa