A. Lange & Söhne

PeterCDE
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Worst case

G'day,

not Edwin, but i´d like to add an aspect or two.

In general, there´s nothing in your watch Lange can´t repair.
You own a fine mechanical watch, made with pride and by a manufacturer who is proud of his products. Of course any mechanical Lange watch can be repaired and brought to life, regardless whether it is 5 or 100 years old.

BUT, noting the downside, of course all repairs are the more expensive the more work needs to be done.
In case parts are damaged due to wear, mishandling or excessive treatment, these need to be exchanged. Example: the pinions of a watch running "dry" without lubricants can wear off due to fragments of the lubricant, which may cause them to be exchanged. That´s tricky, because it requires to fit in a new geartrain (simply put).
Thus keeping service intervals may prevent from damages to grow and become costly, when problems can be spotted very soon after appearing.

Something i´d strongly recommend to do on a strictly annual base is a water resistance check.
The seals and gaskets don´t react well on certain fluids (such as certain soaps and oils) and probably worst to happen is water/moisture inside the watch. Such would be likely to grind away the whole movement in weeks/months and a rusted movement needs to be exchanged completely most times (which isn´t exactly cheap work).
To prevent from such it requires all the seals and gaskets are in fine working order, which is relatively simply checked with a special tool.
For watches in daily wear, better be safe than sorry; Lange AD´s usually are well equipped with all necessary tools and exchanging the seals or gaskets isn´t expensive. Compared to a movement, the crown (these are likewise easily damaged due to impacts) is a lot more affordable too.

So better be safe than sorry later.

Cheers,

Peter