According to my infos ('Panhard - le grand livre' by Dominique Pagneux, Paris, 1996) there were several Callistas, roadster, cabriolet and coupé. The Cabriolet ('Coupe des Alpes') and the coupé ('Auteuil') with vertical grille were always called Callista, but the roadster shown here seems to be the 1951 Ranalagh without the name Callista, as it was presented at the Apollo theatre in Paris. Ranalagh is the streetname where the Panhard dealer Gaillard had his Grand Garage Molière and where these cars were produced. Panhard was no part of the official name, even though all the mechanics came from them. And 33CV only means that the (750cc) engine delivered 33 bhp. So I think it would be best to list this as 1951 Ranalagh Roadster...
