Antique Mosler Safes

how do i open my mosler antique safe?
it is a very old safe that I i have in an old bank building. I have the combination but that just open s a small outer door that nothing can be stored in. The safe has a hand crank on the top left of the safe’s dore that i can only turn a few inches. on the crank it says turn right to open turn left to close. i would love to be able to see whats inside. ty for your help in advance
Get name off of safe contact safe maker, or google it. A locksmith with safe experience could help. I could open with torch, chisel, and sledge.
Antique Mosler Safes