4ky, you're a wealth of knowledge!!! Excellant info. It made me run right out to my gun safe and see if it has the appropriate numbers. My safe is an oooooold Mosler Safe Co. unit built for the U.S. Airforce / Army. It's 76" by 51"by 36"deep w/ double doors. Underwriters Lab. tag says, class A fire rated and T20 burglary rated. The Mosler tag says Spec F1-D and SMNA rating 4 hr. It has 11 bolts. From your post It should be OK as a gun safe.(I think) All this info was painted over, but the steel wool fixed it right up. The inside is OD green so I always figured it was surplus. Anyway,if you see something in these numbers that might be of interest let me know. Thanks again O 4ked one.----7mmrhb