If it was correct, 800 Euros would be a good price for the watch head on its own.
However,
The dial configuration suggests it's the later 168.0057 not a 168.029.
Better pics are required but that arrangement of lettering is not familiar, it looks like it has been relumed and I think it may be a redial.
(and the bracelet end links don't fit)
Perhaps ask the renowned museum for better pictures?