Lincoln Series K 1937 with a body by Brunn , could be a non- or semi collapsible cabriolet. C'est effectivement un semi-cabriolet. Mais cette page est pour les motos... Vraisemblablement Indian... Indian ou Harley difficile à dire
These aren't WLA's (1st produced in 1940 as a military bike in Olive drab) These are probably VLD's