got this info from my u-black operating manual
hope the following is useful, I got these spec from my u-black operating manual: CASE: -tempered submarine steel, black hard coated with a hardness of 1500 HV - hardened diver's bezel with lumnous triangle, .... also got these info for the black u-series ...
Best looking Sinn ever
U black is set to be the BEST looking Sinn watch ever... It is a pity that it is a limited edition.... no more. The rest like yellow face and others with weird colour combination just does not work for Sinn. It is a must have for Sinn collector- Sinn U bl...