The master lock (as pictured) was bought when I was in secondary school. At RI, we were issued lockers and had to use these locks. I have probably not opened it for maybe ten years already, and I have already forgot the code. However, I decided to try opening it, going by “feel”, and surprisingly, I opened the lock on the first try. This is amazing because there are 40 numbers on the dial, and you have to get the three numbers right in order. Out of so many possible combinations, somehow I remembered. The mind is an amazing thing.
Or maybe my lock is spoilt. Let me go test it now.