need help with Mosler lock identification

[jtwjr]

Hello all, Hoping to get some help on identifying the lock in this safe. This was a safe within a safe so it has no model number on it. The serial number would indicate that it is from 1951. It is hard to tell if it is a 4 wheel or 3 wheel lock. At first I thought it was a 4 wheel lock but after some amplification and numerous trys I am not so sure and think it could be a three wheel lock. That fourth wheel is really a soft contact if it is indeed a fourth wheel. This lock only has one contact point at 1 when turning the lock counter clockwise. What would really help me at this point is what kind of lock is in it. Would it be a Yale OC-5 or a mosler lock. Did they come in 3 or 4 wheels?

I have been graphing it and the weird part is sometimes it will give me good points and other times it will not show anything at all. I am wondering if the temperature has anything to do with that. I did two graphs this morning and they were mostly flat. But other times I get distinct points as one would expect.

I am new to safe manipulation but not lock picking and the first thing I really need to know is what lock I am dealing with. I have been unable to find any good model information on Mosler safes which I am thinking is due to their security of not providing information.

Anyway any help from anyone that knows this safe would be helpful. It looks bigger in the pics than it actually is. It is 14"W 13 3/4"H by 16 1/4" L Hopefully the pictures will post

[MartinHewitt]

This is an old style lug door safe. Mosler safes of that time did not have Yale locks. Mosler had at this time a wide variety of locks with three and four wheels and different mechanisms with a final turn to the right and to the left. I can't really say what's inside and any speculation on the lock model will probably mislead you. So I would assume it is a 4-wheeler or at least check sometimes if wheel 4 is showing something. If you can feel the CP at 1 counter clockwise, then the fence will for sure drop counter clockwise if you have the correct combo and you will feel that. I have never heard, that humidity or temperature will influence the CPs. If you get a flat line, than it is usually that a wheel not moved is the high point and all others are shadowed. Some locks provide also or sometimes only information by the strength of the bump at the CP. I include this in my graph by drawing the line thicker and thinner.

[bitbuster]

Possibly Mosler B6