1 KG VERY RARE FAST PETZVAL TYPE UNIQUE BRASS ANTIQUE LENS. There is no manufacture label but it was made by prime brand. Most probably by Ross, Dallmeyer or Darlot. According to measurements it has a focal distance of about 19 cm. And an aperture about F6. According to measurements it covers about 5×7 or some more. VISUAL AND OPTICAL CONDITION IS EXCELLENT. Glass is exccellent without damages, fungus, fog or separation. Rack and pinion mechanism works excellent. There is a diafragm mechanism which is a pretty rare situation as most of such lenses have waterhouse slots for F-Stops. The brass barrel is in excellent condition. Rack and pinion works fine. Lens is about 1 kg in weight. This is a fantastic lens for usage or. Barrell is in excellent condition. Buyers with a feedback of less than 10 points should contact me first!