Cool find, and your photos worked great!
I will tell you that your combination will be 3 numbers and the last thing in the sequence is turning the dial Right in order to retract the 2 bolts that lock the safe. This may be marked at the "4th number of the combination" but it really isn't part of it.
The sequence should be 4 times Left to the 1st number, 3 times Right to the 2nd number, 2 times Left to the 3rd number, 1 time Right to retract the bolt.
Check your forum messages for a document I'll send you..
Here are a couple photos of what it looks like inside, the combination wheels are not pictured.

