CR[Moderator]
4025
A reasonable question. I would tend to believe Lange's assertion about this.
Stere was not the original owner of the watch, and Lange had not seen this watch since Stere bought it a decade ago. Lange watchmakers can often detect cosmetic signs of work done to the movement that you and I may not be able to detect with our untrained eyes. This happens regularly. I also recall hearing that Lange may take a photograph of the caseback, to record the positions of the screws (which will likely change position if/when the caseback is opened), though I am not sure if/when Lange does this.
To be clear, none of this excuses or justifies the price quote that Stere received. That is a separate issue (but certainly a related issue in this case). And I would hope Lange's standard 3500 Euro repair price would cover all work that Lange would perform under Reason #1 (exchanging/upgrading parts): If a person sends a malfunctioning but otherwise undamaged Lange 1 to Lange for repair, I would hope 3500 Euro would be the maximum cost. And if the watch functioned properly and Lange was just performing a routine service, I would hope 1300 Euro (the service/overhaul price) would be the maximum cost.
This is advice for anyone considering buying a preowned Lange: Ask the questions, "Were you the original purchaser of this watch directly from a Lange AD or boutique? Do you have a record of the last service performed by Lange? And is there any possibility that a non-Lange watchmaker ever opened the caseback of this watch for any reason?" The answers to these questions could mean higher service costs.