OMS tanks are manufactured by Faber in Italy. Check the cylinder markings or call Darren at OMS. He'll confirm that their manufacturer is Faber. What may be different is the galvanizing process specified by different distributors, but AFAIK, the standard galvanization process for Fabers is a cold zinc spray. OMS specs the same process for the cylinders they distribute.LUBOLD8431 once bubbled...
OMS tanks do alot better than Faber as far as corrosion goes. They are not the same tank.
Supposedly, there is a Faber cylinder distributed by ScubaLux that displays inferior corrosion resistance, but that could simply be a specification calling for paint and a lower quality galvanization process.