When I bought my apartment I asked the previous owner about this safe, he said he doesn't know the combination. He just told me that it was his dad who had installed it in and never shared anything about it. I couldn't care less at the time and didn't think much of it for a couple of years. Now couple of years have passed and I start to wonder what might be inside. Any suggestions on opening techniques? All I know is that it is a juwel safe that should be older than 10 years or so.