Peter

Lattey sight would be the easiest to replicate as it had no graticule, just magnified the existing SMLE sights. The Gibbs had the Graticule on front lens and the Barnett and Martins had central etched? Black dot on front lens. I have an original Gibbs template for the front lens graticule, like a transfer. Have not worked out if it had special properties for acid etching of image or whether a metal shield was created from template leaving image open and then image sandblasted deeply into glass, If you could see the original graticule image close up it is actually quite rough and crude.