Gary Stephenson wroteOne of the Aussie or NZ fellas showed a patent for John tann by inventor ugo Bernard that mentions a glass protection plate in 1964/65
Earliest Chubb one I can think of is TDR safe late 60’s
Thanks for that Gary. Don’t think I’ve seen that Patent so will have to check my papers next week when I’m back in my bolt hole.
Ugo Bernard was Tann’s Sales Director right up until they were taken over by the Runciman (Stratford) Group in 1966.
It more or less fits in with the Stratford Treasury and their 450 AA Strongroom door which also had the glass.
[unknown]