Preserving value does not mean keeping everything cosmetically perfect

In the used market, functional condition, cosmetics, originality and documentation do not always carry the same weight.

Proper maintenance should first prevent deterioration and failure. Trying to remove every mark may require polishing, refinishing or replacement that changes more value than it restores, especially on vintage items.

For a modern working instrument, reliability may matter more. Maintenance should fit the type of item and the market in which it belongs.