c220 cdi 203 model timing set up?

hi guys,we have replaced the cylinder head gasket on the above mercedes but we are confused with timing marks on the crankshaft,as auto data doesn't seem to show them clearly and can't seem to be able to see anything obvious on the car.we haven't marked it up ourselves as we had suspicion that timing might have jumped as there was a bent exhaust valve.

any help would be appreciated.