You are absolutely right this is a small detail very noticable irl, and this is also the reason why a RO is in general more appreciated on the wrist than on photo*....colors, light reflection etc...
*The white gold screw might be a tell if you move the watch under the light in front of a connoisseur but on a photo I doubt anybody** can tell the difference with your watch if the brush/finish is well done.
**Except may be the super uber experts such as Legend or Quetip or some other here who can detect a rep Ap from room distance
Question: IS your 2121 equipped with the nice oscillating weight ?