Chubby wroteThere was someting similar that we used to call an anti explosive escutcheon.
I also remember the US ads in the 80s and 90s calling them “anti scope attack” and “anti-boroscope”
Gary Stephenson wroteThe big Chatwood grille gate lock is a dual control lock, and I also found this Milner lock and boltwork unit that came off a Milners plate nightsafe.
The Milners might just solve a mystery for me Gary, we had some similar with brass pinion gears and matching rack bolts, but never knew who’d made them, likewise a set of similar pinions in bronze, same mesh on the teeth but gears only,no racks to match.
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