My apologies! I’ve translated the listing for the Zeiss Ikon Nettar 518/16 into English, incorporating all your technical corrections regarding the model code and the Pronto shutter. Zeiss Ikon Nettar (518/16) - Classic 6x6 Folding Camera (c. 1949-1954) Step into the world of post-war medium format photography with this beautifully preserved Zeiss Ikon Nettar (Model 518/16). Manufactured in Stuttgart as the successor to the pre-war models, the 518/16 is celebrated for its robustness and the introduction of the "Signal" system. This system prevents accidental double exposures via a small indicator window near the viewfinder that turns red after the shutter is fired. It remains a masterpiece of compact German design for the 120 film format. Key Benefits Expansive Medium Format: Produces large 6x6 frames on standard 120 roll film, offering exceptional detail, resolution, and that classic analog "depth." Compact Folding Design: Thanks to the self-erecting bellows system, this robust camera folds down into a slim, pocketable profile for easy travel. Double-Exposure Prevention: Features the iconic signal window next to the viewfinder that switches between white and red to remind the photographer to advance the film. Features Camera Type: Folding Bellows Camera Model Identification: 518/16 (clearly embossed in the leatherette on the side of the body) Film Format: 120 Roll Film (6x6cm frames) Lens: Novar-Anastigmat 75mm f/4.5 Shutter: Pronto (engraved on the lens plate) Shutter Speeds: 1/25, 1/50, 1/100, 1/200 sec, plus Bulb (B) Focusing: Manual front-cell focusing (scaled in meters) Condition Rated: 3.5/5 Cosmetic: The camera is in good vintage condition. The satin chrome top plate is very clean, and the black grained leatherette is well-preserved. Minor surface wear and light scratches are visible on the black enamel edges of the folding bed. Bellows: The black leather bellows appear supple and in very good condition, with no obvious light leaks or cracks observed during inspection. Optics: The 75mm Novar lens is visually clear. As with most vintage optics, minor internal dust may be present. The viewfinder is clean. Mechanical: The Pronto shutter fires reliably at all speeds (25, 50, 100, 200). The film advance mechanism and the double-exposure signal (white/red indicator) are fully functional. Note: The original brown leather "Zeiss Ikon" branded ever-ready case is included. It shows honest signs of age and patina but remains structurally sound. What's Included Zeiss Ikon Nettar 518/16 (Signal Nettar) Original Brown Leather Zeiss Ikon Branded Case Why This Product? The Zeiss Ikon Nettar 518/16 is a fantastic choice for both collectors and active analog shooters. The combination of the upgraded Pronto shutter and the reliable 518-chassis makes this a highly capable and portable medium format camera. It is a handsome piece of Stuttgart’s industrial history that is still more than ready to produce stunning 6x6 results today. Keywords: Zeiss Ikon, Nettar, 518/16, Folding Camera, Bellows Camera, 120 Film, Medium Format, 6x6, Vintage Camera, German Engineering, Stuttgart, Novar-Anastigmat, Post-war.