I have an old Mosler safe that I have the combination for and can open the big outside doors,but I do not have the key for the inner doors. There is a knob around the key hole that I removed and I see the number 298 stamped on the shaft and knob (could this be a key number). Looks like it would be a flat key like a suit case would use. One of the handles on the outside of the safe has the number 128568 stamped on it could this be the s/n? Any info on this safe and where I could get a key would be helpful THANKS