I did an identical one, sold online as "Lost combination".
Direct entry safes are the easiest of the combination locks to manipulate. Your lock has three wheels, plus the main wheel directly connected to the dial. Thus, four numbers.
With pressure on the key (clockwise?) you should be able to determine the gap in the main wheel. This is the forth number in the combination.
From here, with some pressure on the key, you will look for the
angle of the key, to determine gate position for each wheel. There are a number of good Youtube videos on this.
Here is the setup I used to manipulate a similar one. I took the photo to show someone else, and added explanations for them.
The rubber band turns the key, to press a lever onto the wheel pack. For any dial position, if the laser spot lowers on the ruler, it means that there is most likely a gate at that number. I pulled against the rubber band to release pressure, turn the wheel to the next dial position, and release the rubber band. Checking every 2.5 numbers is probably OK.
There are quicker and easier ways with just an arm on the key, but this worked for me.
