We can’t and wont go into details on “cracking” safes on this web site as it’s an open forum and there are legal issues involved here. My advise would be to look in the yellow pages for a local locksmith that deals with opening safes. Even if your serial number is listed in old Mosler factory records (I know someone out there has the records), the odds that the combination hasn’t been changed at sometime are pretty rare,so the factory record probably wouldn’t be of much help. I can tell you that getting a locksmith that can manipulate the lock will be expensive, especially if he has to come out to your house to do the work. Good luck with it🙁whew):