Interesting. I thought if one had a compete working watch then it was good? I have a working watch with LWO movement and am now wondering if I also need further parts....
Comfort level means whatever dealer you like.
Like any other manufactured item, sometimes things are missed. The QC are there to ensure that you see what is coming to you to make both parties happy.
Stead(supermirrors) is best contacted via pm. Just tell h what you want and he will get it. Almost all are from the same producer. It comes down to your comfort level.
No matter what, get this watch.
Caseback screws are correct, the one you were looking at still had plastic on it and that distorts them. Not sure about the crown as the movements are different but not a tell on the wrist.