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From the wear pattern you may be able to see that the back of the case is depressed, there is also a dink bottom left and there is a lot of pocket wear, in reality it actually looks worse than in the picture. So something had to be done.
If this were not done the next stage would not work as effectively and the fluid would have to be changed more frequently, perhaps after each case.
The second ultrasonic machine shown is loaded with a solvent based cleaner that I use for cleaning movements.
It is better to press or rub rather than hammer as it will cause less damage to the inside which is difficult to burnish out due to the shape of the case and the necessity of preserving the hallmarks. The amount of work done on the outside has therefore to be balanced with the amount of damage to the inside and possible distortion of the case which may or may not be readily correctable.
The picture above shows the case after this work, the dink still visible but it is now more of a scratch or dirty mark.
In general I do not try and take out all of the marks but to still give a nice finish. All of this is done by hand.
A similar process to the above would be used for a solid gold watch but most of these steps can't be used on gold plated watches because they have a very stiff inner core which makes pressing out dents difficult, although not impossible, and more importantly any hammering or use of abrasives is likely to go through the gold plate exposing the inner core.