Thats an incredible about of work on a watch case, and I wonder how many man hours this would take alone (welding), and then of course the lapping. Very expensive machines iirc, fine grinding machines.

I am unsure how a lapping machine actually works though, I mean, how did that case back on page one get done, polishing the outer circumference, and leaving the centre brushed?

Any links to videos, sites, guides, tutorials would be appreciated.

Also, given the amount of time, effort, and passion put into this work, I am guessing it costs a pretty penny, so the watches being restored with this process must be very very rare, or expensive, £10k+?