What's the difference between these two and Salad Cream?

Lee Van Cleef used one of these in the film Return of Sabata and it is definitely a pistol. They were originally conceived in France as a weapon for assassins and was originally available in a 10 shot 6mm and 7 shot 7mm. In the US it was chambered for .22,.32 center fire and .32 rimfire cartridges. A really nice one would probably go for $2500-$3000 today.