Sargent & Greenleaf 8430 UL 1R Pictures
Posted: Wed May 20, 2020 7:15 am
Another recent acquisition for me. And some more high-res macro shots for you all!
This lock has a mechanism that I hadn't encountered before, in the centre of the dial there's a knob with 'S&G' labelled vertically. While dialing the combination, it needs to be 'locked' with the tabs grouped together to form a wheel (as seen in the photos below). Once the correct combination is entered you can turn the small S&G knob in the middle of the dial and 'unlock' the cam (it is otherwise shielded) and then continue turning the dial right to stop.
It's a cool feature and it would (in my not at all expert opinion) make manipulation very difficult.
Take a close look at the photos of the wheels as well and the deliberately raised sections of varied sizes
One known flaw was that apparently, by watching the chrome pointer while someone is dialing the combination, it was possible to reduce the keyspace required to carry out a successful attack. I would guess that this is why we don't see this type of dial commonly anymore?
If anyone knows any history about these or what years they were in service it would be most appreciated!
Cheers!
This lock has a mechanism that I hadn't encountered before, in the centre of the dial there's a knob with 'S&G' labelled vertically. While dialing the combination, it needs to be 'locked' with the tabs grouped together to form a wheel (as seen in the photos below). Once the correct combination is entered you can turn the small S&G knob in the middle of the dial and 'unlock' the cam (it is otherwise shielded) and then continue turning the dial right to stop.
It's a cool feature and it would (in my not at all expert opinion) make manipulation very difficult.
Take a close look at the photos of the wheels as well and the deliberately raised sections of varied sizes
One known flaw was that apparently, by watching the chrome pointer while someone is dialing the combination, it was possible to reduce the keyspace required to carry out a successful attack. I would guess that this is why we don't see this type of dial commonly anymore?
If anyone knows any history about these or what years they were in service it would be most appreciated!
Cheers!