MG SA cabriolet by Keller/Reinbolt & Christe 1936
2017 Concours d'Elegance Paleis het Loo - Apeldoorn (NL)

Mr. Keller was the manager of the Swiss importer of MG cars named Sportscar AG. Between 1936 and 1939 he ordered Swiss coachbuilder Reinbolt & Christe to design and build a number of bodies on various MG chassis. Nine of those were on the SA type chassis.
The car shown here is likely a replica, since apparently only one of the Reinbolt & Christe bodied MG SA cars has survived, and that one is black with a cream top. The sign on this car however claims it is by Reinbolt & Christe.