How do you unlock your Hartman suitcase when no knowing the combination?

This Hartmann lock is not as simple as resetting the other common 3 ring locks, such as on the Samsonite. There are 999 numbers you can try and it takes about an hour to go through all 999 numbers. Your case will be open then. If you want to pick the lock, you can get a razor blade and slide it between the wheels (left side) and feel for a notch while turning the number wheels. Once you have all three wheels aligned to the notch, just write down the numbers and rotate the entire wheel set around together until it opens.