In the Spring 2006 DGJ, Derek Stimpson's treatment of 'Sights' for double rifles beginning on page 55 mentions ghost-ring peep-sights: "Peep sights tended to be near the breech for a quick 'ghost' sight picture".

Anyone seen, owned, or photographed an original 'ghost-ring' peep-sight on a vintage Brit double? I'm toying with the idea of fitting one to my future 12-bore DR or Paradox project, in the expectation that the gun will outlast my perfect eyesight! I have my own ideas on how to proceed, but wouldn't mind a look at a traditional set-up.

Can anyone help?

BTW, I am considering a low-mounted, truncated counter-bored tube design, which I have built before on the clip-loading bridge of a converted Lee Enfield, rather than the stupid 'wedding-ring' type a la Ashley's original design!