Hey, thanks for the additional information. I notice that both patents involve twin mechanisms which spread the the four flat bars. My safe has just a single gear on the handle shaft which moves the upper flat bar. When the upper bar moves it causes the lower bar to also move by the way that they are coupled. I wonder if this simpler system is an earlier design, or if Briggs had multiple models available at the same time? Can you expand on the topic of other companies that used this system? Did Briggs use other style boltworks? And finally, is this a rare safe that is worth preserving? Thanks again. Ray
