[sandworm101]

These "sergeant greenleaf" locksets are old but common in military/national security use around the world, although military models have a couple extra security features not sold to the public. They are amazing devices. They are 99.9999999% reliable for decades without any maintenance but nevertheless can take a beating. The combination can be changed in seconds. Recovering a forgotten combo is possible with only a screwdriver, so long as the safe is still open. Most are or have been replaced by digital locks, but I've always liked Sergeant Greenleaf.

[sidewndr46]

Is that the same or different from the padlock style ones I see being used to secure military equipment?

[sandworm101]

S&G padlocks are evil. They are hateful devices. The inner working are broadly similar to the full-sized dials but are fiddly little demons. Changing their codes never goes properly, and recovering from a lost code requires multiple special keys. I know of boxes containing dozens of "bricked" S&G padlocks that people have given up trying to use. The difference in design and build quality makes it hard to believe both are made by the same people.

https://mbausa.com/content/downloadfiles/8077_Combo_Recovery...

https://mbausa.com/s-g-padlock-combo-recovery-set/

Compare with the easy change procedure for dials: https://homelandsafes.com/how-to-change-the-combination-on-a...

[dosman33]

Same company makes both combination dials and the large padlocks like the 831, 833, 851. I was lucky enough to tour their manufacturing facility, it's a typical machine shop plus a small foundry as they do their own casting on-site too.