Did DWR ever sell a geniune LC4?  

I would guess no Cassina...
I would guess no Cassina mark, not Genuine.
Here are the manufacturers of the authorized versions:
? Le Corbusier, Rietveld, Mackintosh, Perriand furniture - Cassina
? Barcelona chair - Knoll
? Eames chairs and Noguchi tables - Herman Miller
? Josef Hoffmann furniture - Wittmann
? Pierre Paulin designs - Artifort
? Eero Arnio furniture - Adelta
? Eileen Gray - Classicon
? Alvar Aalto designs - Artek
? Jacobsen designs - Fritz Hansen

Had the stamp. $300. How...
Had the stamp. $300. How did I do?

Did Great!
DWR had a licensed version through Cassina. Last retail price I saw was about 3400. Not bad to knock a zero off the price!
What kind of condition?

Well Done!
that list above is, of course, not exhaustive

it's in like new condition...
it's in like new condition with a few scuffs on the base. It's more comfortable than my eamed lounge.

Ca$$$hhhina...
Sweet! Sammyman is the man! Next stop...Ebay! & 1,000+ profit!

Congrats
Well done!

interesting.....
up until a few weeks ago DWR had all the cassina le corbusier up on their site, and now, no more.
most peculiar mama !
finis.