Vintage Darlot f/3.5 brass lens - 170mm. Serial number: No. 28527. Total height: 120mm. Front lens diameter: 56mm. Screw thread diameter: 74mm. 
Good condition. Presence of some traces of wear. Presence of a few small scratches on the lenses and small chips around the edge of the rear lens. 
Antiq-Photo establishment
Vintage Darlot f/3.5 brass lens - 170mm. Serial number: No. 28527. Total height: 120mm. Front lens diameter: 56mm. Screw thread diameter: 74mm.  Good condition. Presence of some traces of wear. Presence of a few small scratches on the lenses and small chips around the edge of the rear lens.