Mono cylinders

This is a four cylinder combination lock my wife has at work. I've been truing every number in turn to work out if I can find out the correct combination. When I'm bored I try a few more numbers to and so far I've not got round to finding the correct solution...

I've loaded the image in and passed it through the Ilford Delta 100 import filter - which works quite well I think, making it a bit more interesting