Found it!
I had seen before the Bentley Embiricos coupe by Pourtout and thought your car was really close. I was not far from the truth...
It's a 1936 Bentley 4 1/4 Litre (chassis # B25GP) Derby 'Embiricos' Roadster, a one-off car bodied by Chalmers & Gathings in 2014.