In doing my research into gun safes I came across an interesting thread. This is apparently a Liberty Centurion safe. It is believed the burglars used a sledgehammer or axe to break through the safe and it took about 5-6 minutes. One person was working on the side and another worked on the door.
The liberty centurion uses 12 gauge steel for the body which pretty common for most gun safes out there. 12 gauge is 0.1046". It doesn't say how thick the steel is used on the door, but it could be the same 12 gauge wrapped around sheetrock to make it look thicker than it really is.