Well, as said before, it looks superficially like a J2X Le Mans but the opening lines of the bonnet are more like the JR.
Unusual that it's left-handed as even those raced in the USofA were not always so. The windscreen is as found on the unstreamlined J2/J2X so perhaps it was once one of those such as Erwin Goldschmit's (he later had a JR)