Where do you see the crack in the bezel? This
would be a serious issue, I can't spot it though.
Looks like an attractive watch to me. No idea where the dirt on the crown might come from, but honestly, this isn't something that'd put me off if I like a watch. Worst comes to worst you can still have the top of the crown polished carefully or even replace it. Movement looks correct, but not like it has been serviced recently. Which is by no means a no-go, just factor it in. The bracelet is also a nice bonus. If the asking is reasonable, go for it!