This car was a PreWarCar puzzle and this is what was answered:
"About Quiz # 320. 1926 Amilcar CO ! (Update C6)"
". . ."It is an Amilcar C.O. The engine (No. 90025), a 4-cylinder Simca 1200 cc is connected to a 4-speed electric gearbox. The "Coupe" body (Chassis No. 11041) was built by Ateliers De'Grenelle in Paris, based on a Farina design. The car was bought in Switzerland by HM King Bhumibol as a rolling chassis for experimental purposes. The original body proved to be too heavy and was later changed into its present one."
And then corrected:
"The Amilcar chassis number you give pertains to a C6, not C0, and the engine number pertains also to a C6, not a Simca."