It seems that 400 grit is the one used for the normal satin finish on cases and bezels, or something very close to that anyway. The sunburst however requires 120 which is pretty serious stuff, without it though, it just doesn't look right. Having seen a case that was done in Bienne I think it's correct to use such coarse paper. I guess its the reason some Mark II's still show a bit of the finish after all these years.
And pascs, hadn't thought of doing it for others, I didn't think anyone would trust me!
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