Jack at IWW is the obvious choice then, but as your watch will have to cross borders anyway, you might also consider Bry at http://www.satintime.co.uk/, and I think Duarte in the US does work in this field, too (does Duarte have a website?).
Thank you guys for your responses. I am having the watch sent to IWW to have the case refinished.
The link for Duarte was very interesting, I didn't realize that you could have a watch two-tone bead blasted.
My concern is that the tone of the watch's original finish is changed. Jack mentioned that he has refinished Sinn watches before and actually has previously had a Sinn156. I will post pics here when it is done.
Jack should have no problem refinishing the Sinn to factory spec. I've just refinished a Sinn Ezm2 which has the same finish, you can either sandblast to get the correct finish or use a mix grit. Sandblastnig is banned in the UK, so I used a special mixed grit mix.
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