Who is ‘they’?
I have put watches into the AD, they sent off to RSC - who come back with a list of optionals and essentials. AD phoned me to decide/approve what is optional.
RSC, if there is the slightest mark on the crystal will class that as essential. Likewise the crown if marked. Crown is cheap though. Might require a rotor too, as that seems to be a common one they charge for.
Could be £730 in total.