Levers

[Warren63]

Hi all. I've been wanting to ask this question for a while but thought it might sound a bit dim. I collect safe keys, prison keys and safe plaques so my knowledge of locks is pretty minimal. Could anyone explain how to work out how many levers a lock has by looking at the key. I've added a couple of pics so I can explain myself. For some reason I thought that each step in the key signified one lever therefore the large key would have seven levers. Then I thought that the step nearest the bow end might represent two levers because it is somewhat wider. The second key with the wire bow by my calculations would be a five lever because it has five steps. On looking at many keys and locks that tell how many levers the lock has I've now realised that is not so. Therefore could some kind member explain to me if its possible for an idiot like me to tell how many levers a lock has by looking at the key for it. Thankyou