This is a Mosler something-302 or something-402, which existed in multiple flavours and their differences are not relevant for your current problem. The something-302 has 3 wheels, the something-402 4 wheels. I have seen 4-wheel locks only on vault doors so far, so I am pretty convinced, that your lock has only 3 wheels.
This video explains it nicely the opening of a 3-wheel lock:
https://www.youtube.com/watch?v=qEYjgOFKR1UIf your combination has as a fourth number around 90, then it is probably not part of the combo and you should try the first three numbers like in a 3-wheel lock. But you can also try all four numbers like in a 4-wheel lock, just in case. I don't think there is a description on youtube, because the are so rare, but the modification is simple. Dial the first number with 5th to the right and the remaining numbers like in the above video.