I own the z faatory v2. Well put together watch aside from poor power reserve. Issue I have is not much is happening in terms of patina. I've work this watch daily the past 6 months and certainly it does not look shiny brilliant but at the same time really limited patina. I would call it a slight darkening of the metal with a few darker spots here and there. I have seen the analysis of the KW watch that shows it to be true bronze but why has not the z factory watch been tested? Everyone I show it to mentions it looks like brass rather than bronze. I will be surprised if this watch if and when tested turns out to be in actuality bronze.