Do safes made in 1970 contain asbestos specifically model pf6?

We cannot answer your question on a specific safe with a makers NAME- the maker may be able to answer if they are still in business. Asbestos WAS used as an insulating material in many items. MOST document safes (fire rated safes) actually contained a concrete like material. When subjected to a fire, this material released water in the form of steam. The steam prevented papers in the safe from reaching the ignition point of paper- about 450 F.