I spent a very long time Googling all over the place for info on this car, and actually found it in numerous places.
But it was always, without exception, described as a Frua Fiat 1100. One site was quite detailed about it and described it as the first car designed by the great Pietro after he set up on his own; there was no mention of Revelli di Beaumont or Riccobono anywhere...
There is an awful lot of mis-information on the 'Net (and a little correct info too!) but I don't think I've ever looked for something which was so comprehensively described everywhere as something it doesn't seem to be...