Boyer Paris Achro Zircon f/11 lens - 780mm. Serial number: No. 822043. Lens height: 74mm. Screw thread diameter: ø 90mm.
A slot for the introduction of valve diaphragms. Without iris diaphragm.
Good cosmetic condition. No scratch, no peeling, no haze, no fungus. 
Antiq-Photo establishment
Boyer Paris Achro Zircon f/11 lens - 780mm. Serial number: No. 822043. Lens height: 74mm. Screw thread diameter: ø 90mm. A slot for the introduction of valve diaphragms. Without iris diaphragm. Good cosmetic condition. No scratch, no peeling, no haze, no fungus.