OK so I promised when my O1 landed, I would check in and inform on how sharp the case back etching edges are. They are as sharp as a razor, and just resting the unsized watch on my wrist and moving it around with no pressure I could feel it grabbing and trying to scrape or slice me. So, here's how I dealt with it.....
Figured I'd open up the bracelet, seeing as I would be removing links. So I got out my tools, and for cleaning up the sharp back edges, I'm going to use some jewellers rouge and a microfibre cloth.
I have not dealt with screwed links before, what a total pleasure compared to pins and collars!
It helps if the surface of the brick of rouge is roughed up so the cloth will catch it. Rouge generally comes in 3 colours, with red being the finest. Rub some rouge into the cloth.
Here's the case back before I started.
I didn't apply a lot of pressure, and I always moved in a circular direction. You can tell I'm picking up a bit of metal by the discolouration on the cloth. I spent less than 10 minutes working on it.
I can't see a difference, other than I might have left a touch of rouge in some of the grooves. I certainly didn't spoil the 'grain' of the factory finishing, and I did indeed take off at least the very highest spots of the sharpest edges. Probably could get the same result by wearing it for a week but didn't want to shave or irritate my wrist as has been posted elsewhere here.
So, for essentially 0 cost of materials, I dealt with the problem. Do I wish it didn't need to be done, of course, but it's really not that big a deal. I absolutely love how the case back looks, and I did nothing to marr or spoil it.