Speaking of vintage National scams...

[gaucho]

Peep this Craig's List offering. It's obviously at lest 3 different guitars pictured, one with no finish, one with remnants of the Duco. One also has flat F holes and the other rolled. Then there's the price... Something's definitely amiss here. The photo of the one with no finish looks just like my '32 Duolian.
westernmass.craigslist.org/msg/3223192988.html

Be careful folks. There's been a lot of talk of CL scams involving vintage Martins and Gibsons too.

[Quarterquay]

Looking at those pictures,even if you'd never seen a guitar of any description before in your life you'd know those weren't all shots of the same instrument. Surely no one would fall for that and hand over $4000. Why anybody would bother to advertize like that and expect the scam to work I don't know.

[Deleted]

It could be money laundering. Simple way of transfering a lot of cash in an apparently legit way with no chance of anyone actually wanting to buy it.