Many of the really expensive devices like the one you bought and all of the even more expensive Otto Carters ( see VapeRev) are MODs made by other companies ( GG, as an example) , that they buy and embellish with hand carved, .
They buy mods and they make them unique by adding their " art " to them. Then they become one of a kind or like yours 1/50. Only thing that worries me is that without a statement or written paperwork that basic MOD, could be an authentic Golden Greek or Atmizoo etc or it could have started off as a Sieglei , clone, or other low priced MOD. What you are paying for
most likely is the "art" applied to it and other details like the gold plating could also be a custom modification.
If someone had access to the tools and machines , anyone can take a clone or basic low end device and plate the contacts, modify buttons and engrave limited designs and then charge 500.00 or more. Just make sure you are researching the MOD, ask what the basic device is and if they are evasive about it, make sure you love the "art" because it
might be a badly finished bargain MOD.
These are some of the ones by Otto Carter and on description they name the basic mod he used. He takes authentic high end devices and makes them one of a kind, but he does not make the MOD.
This is an authentic CHi You
this is a Golden Greek device