No Czech coachwork.
I was also amazed at this sporty base for a "pick-up". My source is an author I consider knowledgeable and reputable. The 28/95 hp did not have a compressor until 1922. There are pictures of examples with wooden wheels and also of untypical vents in the engine flaps. The superstructure was built in the mid-1920s, possibly giving a luxurious sports car that had grown old a reprieve. There were also examples of this after the Second World War.