STL+3DM This is not visual copy but spring-like functioning construction. Very similar to original brand B0lgar! B-null. Attention! Modeled for advanced jewelers! Difficult to produce, but 100% working result! Hint: font on the caps is single stroke (as in original) and can be perfectly CNC-machined. (Helix parts are for printing, but also can be machined on 5-axis CNC by good CNC specialist ). Once again: This model is only for good artisans.
All info about sizes and gems and additional section of construction shown on preview pictures.