Jan Sliva: There is something special about historic objects. The watches often reveal aspects of their changeful lives. Some have interesting engravings and signatures from which one can tell that they were often handed on or passed down on very special occasions. After a watch reaches Lange, it is partially disassembled, analysed in detail and documented. The next step is to decide which measures are sensible and feasible. Then a cost estimate is prepared (the cost estimate itself is free of charge, editor’s note) and agreement reached with the customer on the work to be undertaken – or not undertaken, as the case may be. Once the watch works properly again, I feel proud and satisfied. And sometimes I wish I owned such a piece myself.

	Jan Silva: Everyone must decide that for themselves. For people who delight in the finest engineering and can afford this hobby, it is definitely well-invested money. But only those with a wealth of experience and the knowledge of what to look out for should get involved in the purchase of expensive watches.

	Jan Silva: If the watch is worn occasionally, it should be disassembled, cleaned, freshly lubricated every three to five years. However, as such a watch is not protected against either water or dust, it is better not to wear it every day. After all, one would not commute to work daily in a 1920 vintage car, either. The best storage conditions are in a dust-free, safe location with a constant temperature and low air humidity.