The crown on my IWC Ingenieur 3227 only just bites the threads when I screw it down. There's also a speck of something on the dial which needs brushing off. I'd probably have it serviced as well.

I'm not sure I trust IWC with it, I certainly wouldn't send any of my vintage pieces to them. Who do you recommend to carry out work to a high standard using the correct parts in the UK?