Vintage Watson London f/8 brass lens - 5 1/2 inch (140mm). Total height: 42mm. Front lens diameter: 32mm. Screw thread diameter: 44mm. 
Good condition. Presence of some traces of wear. Presence of recess on the sun visor. Objective without peeling, without fungus, without haze. Presence of micro cleaning scratches. 
Antiq-Photo establishment
Vintage Watson London f/8 brass lens - 5 1/2 inch (140mm). Total height: 42mm. Front lens diameter: 32mm. Screw thread diameter: 44mm.  Good condition. Presence of some traces of wear. Presence of recess on the sun visor. Objective without peeling, without fungus, without haze. Presence of micro cleaning scratches.