Stop! Please...please...please do not pry on it, anymore.
That is a Jacob Baum safe. Jacob Baum grew up outside Cinci, Ohio. Worked for the Victor Safe & Lock Company (Cinci, Ohio) in the late 1800's to early 1900's. Feeling that he could improve upon the Victor product (and make some $), he started the J.Baum safe company in Cinci. The majority of the patents were filed in the range of 1905-1910, although there was a second "boom" of patents filed between 1920-1931.
The majority of the safes were made from iron (like the Victor models; which makes sense when they were his "learning basis"). However, during WWI and prior to WWII- cast iron was used (an iron/sand/additive mixture), locking mechanisms were usually non-tumbler (that could explain why it sounds as if you have a broken tumbler lock-because it isn't one.) In the 1920 and 1930 models, locks were made with tumblers.
I hope you are not serious about scrapping it. Completely and correctly refurbed that safe is (on the conservative side) around $3000.00. You need to a.)contact a local antiquities dealer who deals in safes and or lockboxes. It is hard to tell exactly which safe you have from the pics and actual current condition. They will be able to better tell you. They will also have the number of a reputable locksmith who is trained to work with THIS type of safe. b.)contact the locksmith.
As for what is inside, J.Baum did do a limited # of gunsafes. However, it is more likely that inside will be one to five safety deposit boxes. Baum's "niche" was personal document safes. If you have gloves, really recommend wearing them when dealing with any papers found inside-the acid (oils) your body produces can destroy/harm the documents.
hth.
Please-keep us posted! If you couldn't tell-this is one of my passions. The craftsmanship is amazing;especially, when the tools (technology) of the time are taken into consideration.
, do not attempt to pry the door loose 
