A treasure trove of images of the original suit that RS Props are in possession of. Full credits go to Voice In The Crowd for allowing us to share his pictures, and to RS Props for allowing him to take the pictures.
The Rexim-Favor was a Spanish-made, Swiss-marketed, and allegedly French-designed submachine gun produced during the 1950s. Only about 5000 were made in total, as the gun failed to procure any significant military or police contracts. Mechanically, it was a pretty typical submachine gun, using a simple blowback mechanism chambered for 9mm Parabellum ammunition. It had a quick-detachable buttstock, and of some interest an easily removeable barrel as well. The barrel was secured by a large external nut which allowed quick removal for transport or changing of barrels. It also fired from a closed bolt, which is a bit atypical for guns of this type. That allowed better practical accuracy, but was also much more expensive to manufacture.